To me, this feels disingenuous.1:46 “This was a migration in the case of the goblinoids (to fey) that we began in MotM. This has actually been going on in the game for a number of years now. And now we finally had a chance to basically have the MM to catch up with where the game had already gone.
MotM gave a number of species (not just goblinoids) "Fey Ancestry" which was an advantage against saves vs. Charm. In most games, that comes into play more often than creature type -- whether you are vulnerable to hold person or not. But they've gone "all the way" with goblinoids, but (apparently) not with all the fey-ancestry species.
And, in MotM, goblinoids were still humanoids and were not fey.
At the same time, there were playable species that were fey: Centaur, Satyr, Fairy, etc. Claiming that the game had already migrated to goblins=fey simply does not seem true, and it seems like they are trying to ret-con something they clearly hadn't done beforem in order to justify it now.
This seems self-evidently true, and it is not the first time designers have imposed top-down decisions about species.Again, this is a top-down designer-originating decision. This is not a player-originating shift.
I can understand why the promotional videos are incentivized not to present it this way, and (not yet having seen the new MM) I haven't yet formed an opinion of the change. But that it is a top-down imposition (what I take to be the main point of the OP) seems absolutely correct.