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.

I personally use Matrix for text and Mumble for voice, but most probably won’t go anywhere. Discord is convenient, and most users won’t care enough about some extra ads to put in the effort to migrate.