True. But I also think that there are useful things to learn about what people actually want. This is easier to see in discussions of consumer products; the most popular products often make design decisions to increase accessibility for more people at the expense of being "better." Or they may be appealing to a zeitgeist even if that zeitgeist is not realized by most consumers (see, e.g., the massive popularity of pick-up trucks in the US, despite the limited use-case for most of them).
But it even applies to music. We think of the early 90s as being dominated by Nirvana and grunge- and that was revolutionary for the time. But Smells Like Teen Spirit, while huge, was only #32 on the Billboard charts for 1992. Do you know who was in the top 10?
Boy II Men (#1!)
Si Mix-a-Lot
Kris Kross
Vanessa Williams
TLC
Eric Clapton
En Vogue
RHCP
Color Me Badd
Jon Secada
....so it goes.