1) this is just extra unessicary work for the mods and and admins
2) This is already done in the discord a bit, feedback is usually not about selfpromoting, so idk why this should be relevant. R4R is still relevant, as you cannot force somebody to rate somebody elses game. This just wont work.
3) This is going to be way too much extra work, considering that brackeys quit yt. And not everybody will watch that video, since a lot of people are way to excited to play the games or to start developing.
4) Then people only would care about that and completely forget to rate and play games and besides that, how are you even gonna determine a winner in something like this? And what should the prise be, considering that brackeys nor the staff generate revenue using this jam.
5) Everybody needs feedback kind of, since live feedback is different than just a plain comment, there is no way of determine such a thing. Also how are you going to make the streamers do something like this?
6) This already exists and not everybody checks their emails frequently
7) this is just extra work, not everybody is willing to do that, this would have to be some sort of pop up from itch and I doubt that they would do that.
8) you are literally reminding other people constantly what they are supposed to do, so it's not really about how good the community is, but rather that you tell people the whole time what to do.
Again, just like in real life, if you work harder you get better rewarded. This would demotivate people too since, "why should i play and rate games, if person b gets the same result as me, or even better without even playing games". If you are going for a solution where everyone gets the same treatment, the jam can get demotivating, since you don't get rewarded for your work. As I've mentioned before, promoting your game is as important in jams as in real life, you can't expect to make the next big hit without even telling people about the game, how are they supposed to know about it. Your ideas sound good on the surface, but I personally think it's way more complicated.