> Posts that assume everyone considers certain changes to Firefox "anti-features" aren't going to win everyone over, either.
This seems like a bad faith characterisation. The discussion was about ars's activities, and I think it is reasonable to assume silversconfused was guessing at ars's opinions on these changes, not at "everyone's" opinions.
There are good reasons for the move to Web Extensions, the deprecation of XUL, more careful checking/validation of extensions, and other such changes.