Hot Take: WotC should be MUCH more aggressive when it comes to the Game Changers List
When we get down to the foundation of the new Bracket system, it boils down to MLD, chaining Extra Turns, 2 card infinte combos, tutors, and the Game Changers List. These are what define Brackets 2 and 3. Realistically speaking, Brackets 1, 4, and 5 are mindset based. They don't really require a specific rule set.
With that in mind, I think it's been pretty clear from discourse since Brackets have been announced that chaining extra turns and 2 card infinite combos need to be better defined. That leaves us with the Game Changers List. A fairly conservative list with a group of cards that, surprise, none of us agree on.
This takes me to my take. I think if WotC wants to really facilitate a casual gaming experience, going hard is not necessarily the wrong move. Anyone who wants to complain they can't use X card in a Bracket 2 deck...probably shouldn't be playing in Bracket 2 to begin with. If you think about what a Bracket 2 format should look like, it should be what casuals want, a Battlecruiser style meta. The Game Changers list, in essence, is a casual ban list and should be utilized as such. I will say, depending on hard they go, I would be amenable to them increasing the amount of Game Changers allowed in Bracket 3.
Finally, let me just say, I am fully aware there is no way to completely stop bad actors from utilizing whatever list WotC comes up with to angle shoot and build decks to pubstomp players. That said, I don't think its really possible to make any system account for such people, and we shouldn't let their behavior stop us from making a better system than what we have now.