No I'm not using Kali for "hacking" I'm experimenting if I can play games on it and I guess my little experiment failed here, I never had a smooth experience with Debian before it always break itself when doing a system updates.
Yup! Kali is a rolling distro built on Debian Testing, not Stable, annual releases. It can be used as a desktop OS, but still has pen testing and other security tools as their main focus