Interesting questions. I'm afraid I don't really have an answer though.
I don't post in critique as much as I used to. I have found it genuinely useful before though, as it's much harder to spot the mistakes in your own writing than in someone else's and the feedback has helped me get better at spotting my own mistakes.
Now I tend to post in critique if it's something I'm not sure about or it's something I've not tried before, like a mockumentary.
I don't suppose I'll ever be 'groundbreaking' but I do enjoy trying to do something a bit different. Sometimes it works, sometimes it doesn't but trying it out on here can be helpful to gauge which of those it might be!