these days I wanted to uninstall the add-on "custom fields" of waindigo. I have done as usual with a click of your stall ...
But the result was devastating - some tables of the resource managers were thereby destroyed.
As a result, numerous error messages came in the error log. So I had to look for a solution and found it in the discussion theme of the add-on. I am not alone.
The problem is known since november 2014 - but the developer does not consider it necessary to fix the problem or to give a hint to beware users to lose there data.
Would not it be good if XenForo would check at least the basic installation / uninstall from new add-ons or in such big errors are known - mark an add-on, as a warning to the user?
In phpBB support forums - the staff can close support threads from add-ons and leaf a message with a warning when a add-on is not supported. I think thats not a bad idea.