Building muscle does not make them tight. It actually makes you more durable and supports your joints through a full range of motion.I think also today athletes try to max out their muscles, making them tight, just on the verge of tearing. Actually, the whole process of building muscle is tiny tears that then heal.
I like what the KC QB Mahomes has done, trying to keep a certain amount of body fat to add padding for all of the pounding he takes during the season, while still trying to be "athletic". Endurance and recovery are also parts of being athletic.