It's probably the largest TTRPG playtest in history, where they are changing specifically the pain points for people with the game, and testing changes multiple times inhouse and then in public, working through the issues people have with the game. THAT is not just a motive of "new edition smell" nor is it a societal ingrained idea that "old = bad." When people say "I don't like this part of the existing rules but I do like this new version of that rule" that really is in fact "old = bad" in a direct feedback way.
Druid (Moon) was not "perfectly fine" for a large number of people. Ranger Beastmaster was not "perfectly fine" for a large number of people. Monk (all subclasses) was not "perfectly fine" for a large number of people. Certain spells which essentially did nothing like True Strike was not "perfectly fine" for a large number of people.
The feedback players gave, by the thousands, was not "everything is perfectly fine." And the motives for people to change are not fairly characterized as a simple "new edition smell." We can argue about having to pay for errata, but many changes being made are meaningful and were in fact portions of the game people were not fine with, for years now (and with at least one of those I mentioned above, they had feedback way back in 2014 people were not perfectly fine with it even then). They're not being "changed for no real reason" but are being changed because an extreme overwhelming majority voted with their feedback that they really wanted that change. For some of these topics at over 90%.
To dismiss all of that as just "new edition smell" is frankly a tad flippant concerning the opinions of thousands who have been providing feedback for a year or more now.