I can't tell you about 3D modeling, but gaming should work fine. Proton and WINE are working so well to handle games that it's almost to the level where I consider it magic. Hell, I have some older games that honestly were easier to get running on Linux without having to mess with compatibility options, and newer games are running surprisingly smooth. I do not even have an overpowered machine or anything, it's a 4 year old laptop.
