Why!!!!!! A small bezel is perfectly fine, as most of us use a case anyway. We don't every single mm of screen. I want my case to wrap over the edge and it would cover the small bezel anyway. Just because you can doesn't mean you should when it brings ZERO benefits to the use other than it looks cool.
Apple could be set to all but completely eliminate the bezels on an upcoming iPhone, according to well-known tipster, Ice Universe. The company will also take Face ID completely under the display at the same time.