I think part of the problem is also people are able to guest onto a different server and piggyback on their server for these events instead of re-examine their strategies and builds. There is really no incentive to successfully completing these kind of events as a main server.
Yes, this. Right now a lot of servers suffer from this problem. Everybody is guesting to Deso to do it there instead, leaving the main server desolated (no pun intended). I would really like to beat it at my main server (FoW), just to put in the effort with all my fellow guildies/server buddies, to learn and combine our efforts to beat this challenge. But so far, the main reaction is “why? just guest to Deso, we have beaten it X-times today there already…” Leaving the FoW home map occupied with new players and random guests, since all the experienced players are guesting to a “better” server. No wonder we still struggle.