A lot has changed since 2015 thanks to Proton. However, it’s not a magic pill. Some tinkering might be required, with how much and how often depends on what you play. So just give it a try and see it for yourself, dual boot is a viable option. Pick some user-friendly distro that handles Windows detection and offers easy video drivers installation. Are you sure that Debian is that distro given your struggles with Arch Linux? I’m not that familiar with it myself, I thought that Debian comes in a relatively raw state.
Privacy is not anonymity.