The other threads are now tagged "Lack of interest," so I guess they're dead.
With the new ability in XF 2.1 to upload video, attachment quotas I feel are now needed even more. Server admins and site owners are not bottomless money pits who can afford to buy endless storage partly due to idiotic users who feel they need to upload anything and everything. We had to disable attachments on a couple of forums for that reason. For us, attachments are basically useless without a quota system, and we don't use them.
What a shame, really.