Specifically, anything in Support and Tutorials.
I’ve maintained a support topic for years on the Ubuntu MATE forum covering how to install the legacy build of Pulseaudio Equalizer as provided by WebUpd8’s PPA, across multiple versions of Ubuntu.
New information about a topic for a tutorial may be sought and found months in the future, and with the way it is right now, I would have to create an entirely new thread every single time I make a mistake and omit information for too long, or find new information to incorporate, or quote entire blocks of text and leave a reply that nobody will ever read.
This time-limited stuff is madness. I can see how unlimited time can be a problem if someone’s account was compromised and suddenly there are a bunch of edits to threads which turn them into advertisements or some other bullocks like that, but to resolve would be as simple as freezing an account, rolling back those edits and waiting on a user to reclaim access with a new password.
The way things are done now will lead to a bunch of redundant posts with just a little bit extra information because OP is unable to edit the original topic.