You risk driving away your evangelists for one. If you only focus on the most popular features you eventually narrow your product to one feature, so obviously

You risk driving away your evangelists for one. If you only focus on the most popular features you eventually narrow your product to one feature, so obviously there is a balance in there somewhere between focus and utility as well. Identifying why people use your product is as important as knowing what they use. Chrome does all the things I actually use from Firefox, but I use Firefox because when I ever need slightly more hackability it is there for me. That is at best, a once a year occurance.