True, but it's also the fact that strength sports focus on specific movements. If you're a PLer you squat-bench-dead. You have to, that's the sport. If you took one of those movements out of your training for a prolonged period it wouldn't be a great idea.
If you're a bber then you can completely ignore those movements or only do variations that train only a specific portion of that movement and there is no legality involved, if a bber with ridiculous quads doesn't hit parallel on his squats it doesn't matter at all. If a PLer doesn't then his lift doesn't count. A bber never has to squat at all and can still build some thick legs.