Why can't you make these features disabled by default instead of forcing it on everyone? Admins can then enable per user when, and if, they think it is appropriate to use. Clutter was a disaster IMO. I had to tell users to check their spam quarantines AND check their clutter folders if they couldn't find an email. This is all assuming they knew they had a missing email. Most people don't know they have a missing email so it goes days before they discover it and never fail, the email that was in the clutter folder was super important. Ugh! I ended up disabling it for everyone just to stop the insanity.
So now here we go again. I'm sure some important email is going to get sent to the "Other" tab and get missed for days. I will be disabling as soon as it is released and enable only if it makes sense. (i.e. after testing it out)