I've made the argument for 2/3 in another thread, glad to see we are starting with that.
Interactables I believe and hope will be banned in the future. I agree that the first couple tournaments (Civil War, NCR, what have you) should at least experiment with interactables. That said, I really hope by UFGT interactables are banned. We'll have to see how it plays out in the coming weeks.
The stage selection is something I really disagree with. The 50/50 option makes no sense, it was clearly added as a feature for online play so you aren't stuck with one player selecting the stage in a game where stages can greatly benefit you. We are not playing online though, we are at a tournament. It should have standard tournament rules for a game with stages that give large benefit based on which side you are on/which character you are.
Rule should be random stage, loser can re-random or rematch. Their choice. Standard FGC rules for games that the stage affects matches greatly. (Soul Calibur, Tekken, etc)