about 3 years ago - Zoythrus™ - Direct link
Xin-Xi recently got a buff in a few ways, with climbing also getting a defensive bonus and ruins having a greater chance to spawn no mountains, so Xin-Xi gets exploration bonuses.

Luxidoor originally started with a Lvl3 capital and a wall, but that was considered extremely OP, and they were nerfed a few updates ago into what they are now. Maybe a little lackluster compared to before, but they've still got a niche and aren't too shabby.