I'm curious. Are there any customization heavy MMOs that can support having several dozen people in the same place without noticeable consequences?

In PSO2 there were significant load-in times for character models just with a few dozen players in the lobby areas so I'm honestly doubtful of how much customization XIV could handle before it starts effecting things negatively.

Granted, just having more scale/horn options would be a far cry from everything that game offers, but considering how dicey the server code can be as is...