First off, get trolled harder... you can't. Secondly what is metal? Guy on page 1 says Crue and Def aren't metal and then links a thrash vid. If Zeppelin and Sabbath invented "metal" then Poison, Crue, Def, GN'R, White Snake, Tesla, etc... are all much closer to metal than what you linked. However it's all just some rando a-hole who created a word subjective opinion. Metallica, Megadeath, Maiden, thrash metal, the 80's hair bands were hair metal. It's like the argument everyone is trying to have on rap or hip hop or whatever you want to call it. Talib Kweli, Mos Def, Common, do the same music as Jay-Z, Drake, Kendrick, etc... It just so happens that in my opinion the Kweli's of the world spit the hot fire of Dylan more than Drake does. I wish with all my heart Blackstar could of done another album and while I love Hi-Tek, I just imagine Kweli and Mos getting ill on 15 tracks that were produced by Kanye, Dre, No ID. Would of been incredible. Lastly using Taylor Swift as put down is utterly ridiculous, she is one of the few females country, pop, whatever who writes her own tunes.
First, that's not thrash. Stop it. You making that assessment is the metal equivalent of the guy who makes broad brush statements like "all new hip hop sucks" or that Wacka Flocka Flame and Talib Kweli are in the same category of radio garbage. It seems like you are pretty passionate about fighting ignorance re: hip hop, so stop spreading it, re:metal.
Second, I was making a tongue in cheek post, but your attempt to discredit it was so clumsy, that I can't help but comment. Again, though, if you want to debate, at least have that debate with me while not misidentifying Arch Enemy.
Now, go find me two similar recordings between Sabbath (especially the era you're talking about) and any of the makeup-wearing bands you mention.
I'll enjoy the piece and quiet while you pursue that impossible task.
Also, understand that not every track by Sabbath was a metal track. Just like the other metal bands of that era (though they were among the very earliest), they grew up listening to rock and blues, as well. Still, early Sabbath's darker tracks were certainly metal, even if they weren't as great as some of the later albums produced in the genre, imo.
Now, your biggest problem right off the bat is that you lazily lumped in a bunch of bands together with varying degrees of metal influence. GNR might well be the best rock band of the past 35 years, but they're not metal.
Poison have as much to do with metal as the top right corner of the periodic table. They played ho-hum pop through a JCM 800. There's no such thing as a metal song by Poison.
Ditto for Def Leppard, although they do it with better tone now that Cambell joined them and threw his Engl power amp into the mix (the definition of overkill)
It's not iredeemable music, necessarily. In my opinion, they're not as good as some of the other bands mentioned, but the main point is that it's nothing resembling metal.
Crue and Tesla (when they felt like it - eg. Modern Day Cowboy) are much better examples of bands with some metal influence, but based on the rest of this, that could be more of a "broken clock twice a day" thing than an accurate analysis. The funny thing is that "Kickstart My Heart" is more metal than the entire Poison/Leppard discos combined.
Lumping the bands together based on era/hair/makeup is lazy much like when those basketball analysts insist on comparing every white player to other white players.
Again, I was originally making a joke at the expense of "hair metal", which features a bunch of bands frequently lumped together with little sense (as you've just exhibited), with many of them having nothing to do with actual metal. My point (which was entirely light-hearted towards the guy I quoted) was that guys who jump to the bands he listed first thing when they think "metal" tend to be miscalibrated.
Even if they list Crue or WASP, which are more metal than most of the rest, they tend to also want to throw in Bon Jovi or Poison into the same category, which is inaccurate. If you want big-hair 80s bands for this conversation, you should really start with Nitro.
Anyways, on to Zeppelin.
Zeppelin influenced a bunch of metal bands, but that's different than performing metal. They had a couple of tunes that started to push into that territory, like Achilles Last Stand and Kashmir, but the reality is that they were a hard rock/blues band, and one of the greatest of all time - who had unbelievable influence on both the future of rock and metal, who started to crack through the ice in a couple songs, but that transition was finalized by their successors.
By the 70s /early 80s there were already bands that were producing full fledged metal, no qualifiers needed, including Sabbath (way ahead of the curve), Rainbow (wrote both rock songs and fully metal songs right up until RJD left), Dio, Maiden, Priest (though they still played some rock even into the 80s) etc, and there was also extreme metal coming together at that point, like Venom and Celtic Frost and Napalm Death (well, they were punk and then headed towards metal soon after).
You want to know what some relatively early metal sounds like? Here it is in 1978.
There's no ambiguity there. On tracks like these, the rock n' roll elements are gone. It would fit in seamlessly on Maiden albums released a decade later.
You can see in the title that Rainbow was still calling itself rock at this stage, and that disconnect on the direction of the sound was actually the key reason for the imminent split.
Ronnie James Dio had for a couple years been slipping in tunes with this early metal sound he was devising, and the other creative force in the band, legendary guitarist Ritchie Blackmore, wanted to stay in rock territory for commercial reasons.
So right after this album, Dio went on to join Sabbath to continue writing metal, and then soon after, formed his own, self titled band, which debuted with Holy Diver, an all-time metal classic.
If you're still having trouble telling between rock and metal, this is actually a perfect case study. Listen to the above track, and then listen to the next Rainbow album (Down to Earth), when Blackmore went back to writing rock full-time. It's a catchy enough album, but it sounds more like Grand Funk Railroad than the stuff Dio was writing at the time, even though you've got the same guitarist using the same amps.