I'm not sure but i have the impression because right now we don't have sound-limitations anymore, so its easier to create music and maybe less effort put into it.
In the past because of the limitation they really pushed the sound-capabilities, melodies etc to the limit. thats why some songs sounds so amazing.
Same goes for graphics in the old days. I still like nice amiga-pictures more then what we have nowadays.
Look at todays movies compared to movies of the past. in the past alot of movies were amazing. nowadays its being overrun by CGI to the point that it becomes ridiculously overdone etc.
I am convinced that limitations gets more true skills out of the "artist" then without limitations.