FFXIV instancing code and resources cannot handle everyone being in their own instance. FFXIV needs some people in shared spaces, like waiting to zerg S marks.

I realize FFXIV doesn't want to ramp up a bunch of servers in case subscriptions fall, but instancing is a severe problem. Unless it's fixed, new features that rely on instancing (airships, housing, etc) will continue to be restricted to a tiny group of players and out of reach of the majority of players ... who are paying subscription just like everyone else.