Accepting anti-features in exchange for security hotfixes isn't going to win everyone over.
There are good reasons for the move to Web Extensions, the deprecation of XUL, more careful checking/validation of extensions, and other such changes.
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.