Hmm, yes and no. This is Chromium. If you check Chrome, you’ll see the same thing there. So it’s an upstream change rather than it being something that Brave has done.
Because it was still new enough and it was there in case it broke anything. Once it becomes stable, it gets removed from the experimental flags.
You can’t. At least no simple “front facing” ways. It would require edits to the code and not really “simple.”
The only thing that stays the same is that everything changes.
People make requests, improvements are made, etc. Not everyone is going to like every change but that’s just part of life as well. They can’t and won’t put in a million different options and varieties into things as it would be a lot of money, time, and would increase the chances of things breaking.