Wow! Great news here, you are personally allowed to operate a rogue server for that live game you like! Seriously, you’ve got a whole team ready to support you running that server, that’s pretty awesome. No, don’t ask about how it happened. The negotiations of the hypothetical thought experiment legal department are arcane and best not scrutinized. The upshot is that you get to make a change to a live MMO based solely around what you want to see.
Of course, this hypothetical scenario means that only live games not running on rogue servers are eligible, and your change has to be something technically doable in some way; you couldn’t, for example, add a housing system to a game which doesn’t have one. But you could alter the mechanics, the reward setup, the endgame model, leveling, maybe even available classes and customization options. So in this hypothetical scenario, what one change would you make in your fictional rogue server for a live MMO?