A lot of people forget the time spent on porn, when analyzing whether it's a good thing or bad thing. I really believe that if you don't spend too much time per session you'll be fine. PornHub stats show the avg time spent to be 15 mins, around that time is a good goal (don't mindlessly edge for too long). Then with the stats on prostate health showing benefits, it's only a good thing.
Two big complaints I've seen are people regretting too much time wasted on porn, and conventional porn not doing it for them, so they try types they say they regret. I'm not saying limit the time spent every time, but perhaps most of the time could help with those issues, for those that have those complaints.
I doubt that. A state of sexual frustration and depression is not exactly a good mindset for finding a long term partner. It's better to get it out of the way.
It would lead mainly to quick tinder style hookups which I don't like. For me the emotional connection comes first.