Have you played Natural Selection?

I don't like NS2 but I played NS1 alot and it's the first? or atleast best FPS RTS to date! Now only these guys play it: https://www.ensl.org

The problem is seeding something like that with players.

But I'm leaning into what you describe: PUBG (roguelike/punishing/PvP everywhere) + BotW (looks) + Minecraft (proc. gen. voxel and moddable) + Roblox (resellable) is the aim for my engine.