I don’t know much about how taking servers down works and what is involved, but I am one of those people that spend a lot of time tweaking their ui (maybe 15-20% of my /played).
During server maintenance I’ve always found myself wishing I could have access to my character(s) in something like the “white training room of endless nothingness” as seen in The Matrix or Dragonball Z.
Would it be incredibly hard/expensive/involving for them to create a “sandbox” server which is basically just one of the training dummy rooms (I vote Zuldazaar) with the entry/exit doors blocked off? It would only go up during server downtime/outages and would work on the same patch that the game ran when the servers went down.
It would give people like me a LOT more uptime and would massively mitigate the misfortune of having nothing going on on an extended maintenance day.