Sadly this was told about other “Stable” releases like 0.19.1 or .2 where critical bugs where easily found that either broke federation and other stuff.
Many things doesnt even really affect the user but is a burden on the administrative / hosting side, for example the weirdly and buggy report list ( that is still on 0.19.3 ), it can be expected that we will again wait few releases for any critical bugs reported by the instances using it.
Yep those are some of the issues we have upgrading for now. + some performance issues we found on various other instances and we dont know if this will be affecting us even more with our size.