if you're actively using your brain to figure out why they put down each line, sure, but otherwise you learn nothing more than line control>>4198874
there's almost no reason to straight up trace when doing a study side by side forces you to think harder about the forms/lines + construction and doubles as observation practice>>4200447
copying from 3D models or photobashing is an edge case, it can be good to pump out artwork quickly but you obviously won't learn as much as drawing from imagination.
you also don't learn when to intentionally flub anatomy/perspective for strange poses, extreme foreshortening, or to emphasize certain things>>4207416
but past the /beg/ point you can skip the tracing step and go straight to doing a study off the photo itself
tl;dr: art is very much intuition/problem solving, the more you force yourself to think the better you'll become