DnD has always been about both player and DM imagination, if there wasn't something on the topic in the rules book, it was encouraged to make a choice and go with it; that how home rules are born. More and more WoTC is trying to make rules for everything and account for every single situation, which in turn is taking away the imagination and creativity from both the DM and Player, which in my opinion is making the game worse overall. I see more and more people going to places like reddit to ask other what to do when the book doesn't tell them distinctly what to do, and it's really disheartening that people have lost the ability to be creative and imaginative while playing this game. This game has slowly taught people "Learned Helplessness" and it's going to eventually come back to bite them in the ass; because you can't account for every single situation. Now with having two celebrity DMs offering guidance or input on the new book, it's only going to make things worse, because these two celebrities are well liked not only because of how they play the game and who they play the games with, but because they are WAY more creative with the game these days than most people playing it.
For anyone wondering, "Learned Helplessness" in the VERY basic sense, is the term used to anyone that has learned that any small minor inconvenience or lack of guidance sends them into a state of depression and lack of drive. In the case of players:
They run into a situation where the DMG or PHB doesn't tell them exactly what to do -> They feel they have lost control of the game via the lack of that guidance -> They decide to do nothing despite being given the option to make it up
or
They run into a situation where the DMG or PHB doesn't tell them exactly what to do -> they make a ruling that the party gives them any slight negative reaction, giving them the notion they are losing control of their game -> They decide to backtrack on it and then decide to either do whatever one of the players says or decide to ask someone else what to do despite being the option to either stick with their choice or make something else up.
With WoTC asking these two to add any input into this game is only going to lead to more issue, on top of the adding for more grey areas they can't really control or truly account for.