I have no problem with functional protuberances. In fact, I wouldn’t mind seeing more, such as a universal mounting connector of some sort? I don’t know if I am atypical in this regard, but I like mounting my phone on things. Handlebars, car dashes, tripods, mic stands, etc. There are solutions for this, but they invariably involve something wrapping around and blocking some of the front side of the phone, which has become increasingly problematic over the years with screens pushing towards the edges. My bike holder sometimes blocks the front-facing camera needed to unlock the iPhone, for example. But if there were something on the back side that a mounting bracket could securely latch onto, none of this would be a problem.