This is nothing new though, this has been true since the rise of TV and things like top of the pops. Because guess what? People prefer pretty people.
Once artists became visible, this was inevitable. The pretty people were going to become popular regardless of whether the music industry got involved or not.
A french singer contest saw a normal/chubby girl winning by a wide margin. The tour after te tv show bombed horribly.
There's a reflex in crowds to seek for some traits and physical "beauty" seems one of them. The rest seems the exception (and those singers have either very special skills or a super solid persona)
Once artists became visible, this was inevitable. The pretty people were going to become popular regardless of whether the music industry got involved or not.