I think this is geared more towards people doing bodybuilding splits, rather than fitness in general.

Personally, as someone that exercises but not for aesthetics, I think of strength training in terms of movements not muscles worked. So I'm thinking "press, pull, squat, hinge" not "chest, lats, glutes". Thinking of function and then doing fundamental compound movements just makes more sense to me, although I do sometimes need to hone in on a muscle for functional reasons -- like targeting the glute medius for opening up my kicks in my Muay Thai training.

Neither is more correct, they're just different approaches.