Firstly, I'm using the term "OneDnD" here only because we have to call it something to discuss it. It is ultimately whatever WotC decides to call it. So let's not get hung up on the label. I think WotC themselves don't yet know exactly what they're going to call whatever they come up with next year, and terms like OneDnD and 5e(2024) are all placeholders at this point.
Secondly, I am certainly not assuming or claiming that WotC has "imposed" anything on Larian. To the contrary, I believe WotC and Larian are partners on the OneDnD project, with many of Larian's ideas for changing up 5e rules for BG3 being adopted by WotC for OneDnD. In fact, I may even go so far as to believe that BG3 is a big part of play-testing/fanbase-testing rules changes for OneDnD.
I tend to agree with this.
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Also, just to say, someone above referenced it as DnDone. I've never heard that before, but it's funny. I mean, I don't have any feelings about it one way or the other; I just think it's a clever twist of rhetoric.