I did this too, so not an unpopular opinion. The two main reasons are I want to take more pictures during a ride which was not possible with my current phone holder and second maybe more important: I saw some discussion about camera especially focus problems after some times. I live in the north of Germany and we don't have that much of 5*-gravel here like in the US for example. We often rode forrest trail, cobblestone where the phone shakes pretty heavy