b) I can understand a gamer who cares mainly about the background getting annoyed by consistent mixed detatchments, or consistent "Counts As" homebrew marine chapters/other stuff that doesn't include the iconic stuff and so on.
I don't necessarily agree with it, but I do understand it. For some people, it does not fit their game, particularly the more 'cynical' 'slap some grey paint on some squads and use them as SW instead of SM' and so on. I am pro-ally. I'm considering my own 'Count As' homebrew chapter. But there are a few negative issues to this all, and I can understand the man getting het up by them.