underthumb
First Post
Although you acknowledge in your original post that's not the reason they did it.
The neckbeards who constitute much of the D&D population are just another few servings of 7-Eleven nachos from their final heart attack. Creating additional barriers to entry for new gamers is a bad idea, if you have any desire for there to be future generations that play D&D.
With respect to "change for the sake of change," you're correct, that was sloppy argumentation on my part. While some of the changes to the cosmology do feel arbitrary, the bulk of my post was about questioning the worth of changes that have clearer justifications.
I understand your point about graybeards, but I don't think that Planescape and its associated complexity are (or ever were) a barrier to entry for newcomers. The planes have always been "a place you can go" rather than something you are forced to deal with upon learning the system.