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11 days ago(I came from i3)
Still use rofi, because too lazy to configure something else. (My scripts are heavily based on adi1090x/rofi).
I took my polybar config and made waybar look pretty much the same.
Not sure what you mean by “shell” exactly.
I have installed all of those Sims games at one point. It works fine. Mods work without any problems as well.
Lutris will help you for the most part.
I think for Sims 3, I specifically had to use Lutris 7.2 as the runner (IIRC, I have to check again). It didn’t work with other versions. I will verify this when I’m home.
I did the most setup for Sims 3 (there is a whole guide for performance). I don’t remember details too well, but it’s still set up I think, so you can go ahaed and ask questions
Minecraft runs native, for Steam games you can see protondb.com
I’d be worried a bit about the Nvidia GPU. But since I have no experience with them, someone else should give you advice on this.