Personally, the main thing keeping me on Xorg is support for global keybinds. Plasma and GNOME both have support for the XDG portal which mostly addresses this, but apps still needs to adopt it. Plasma also has a workaround for global keybindings, but I don’t use that. Sway doesn’t have any good solutions for this last time I checked.
Overall, I like Wayland more but I need support for global keybindings for at least a couple programs I regularly use.
Does the Mass Effect 3 multiplayer count, then? There are RPG elements, there are a bunch of playable women, and it is all about stomping hordes.
If this sounds appealing and you aren’t already aware: this is not available in the remaster. Andromeda has a version of this, too.
Arma is an interesting example. I’d say that it is only an open world game in some scenarios, and often times is a linear game that happens to have a big map and sandbox.
In any case, I’d agree that it having a large world with many possibilities is important for the gameplay and ability to mod/create content across the maps.
Remote Wayland, no, as it isn’t network transparent like X11 is. You can still do remote desktops, though, usually with RDP or VNC. On the popular modern toolkits, this works out about the same, since drawing applications through X11 is not so common anymore.