I watched the video, and towards the end 12:14 (after he goes through all of the cards), he mentions that Dom used to be about simplicity, grab x cards, and go. But here, there are a lot of dependencies. I wonder if he brought them up in his reviews of other Dom sets (e.g. Looter and Ruins, Prize and Prizes). Granted, it was as pronounced a problem back then.
However, I really do suspect if expansions were more so about "more of the same thing", would it have flown with gamers in general? No new mechanics, or complicated ones, and cards are just retreads of the same attributes. For example, there's now a card that does +2 cards and +2 actions (which would be Lost City), but not include the other new mechanics (for Adventures, would lack Player tokens, Events, Traveler, and Tavern/Reserve).
You can always just leave out the stuff that's too complicated or rubs you the wrong way (in this case, all cards that use Hexes, Boons, and other dependencies like Heirlooms). However, he is free to say he doesn't like this, and it's expensive to buy a new expansions, only to strip away so many other things.