Scott Christian
Hero
Absolutely no mention of losing players in my post.If those tables are weak enough in their desire to not have these rules that the mere publication of the book overcomes that desire - well, it must not be that big a deal for them.
Anyone can make a custom setting, and anyone can restrict add-on books. If doing so loses players, maybe the DM is being too restrictive for their pool of available players. Too bad.
I have stated that it might make some of the DM's earlier works dismissive. It might break immersion for a player or DM. It might have a negative (or positive) effect on the table as a whole. But to make it a black and white argument is not what it is.