lol, well I didn't want to stir up things though. It was more of a "reminder" that some posts (NOT only mine!) are informative. I knew WDZ often only reads the topic (what would you do when you need to prune 1000's of threads) and based on that prunes the thread.
I didn't wanted to blame anyone, only maybe start a discussion in finding a proper way to identify such threads.
Maybe some posts can simply be reposted though (like if it was 1 big informative post in a less informative/spammy thread), but for some threads, you need to read the whole thing...
Maybe making a list of some kind with "important" threads which may not be pruned? Something in between the thread-rating feature and the report-feature. Everybody can "recommend" a thread for not-pruning, but in the end admin decides.*
And I'm also thinking of an automatic redirection. For example like in this case. Let's say the thread has been pruned (because it contained to much offtopic/spam/etc...), but there was 1 informative post in it. Now, when people refer to that post, people will get the "this thread doesn't exist". Maybe it could be possible that the link is redirected to the reposted (new) message. If you know what I mean. *
(* note: these are just a wild thoughts, didn't think of the consequences/advantages/disadvantages/etc yet.)