Gaming on Linux for me started getting easy for me around WINE 3.0-ish, when EverQuest (and other MMOs of that time period) started running pretty near flawlessly for me. That's when my Windows XP/7 partition finally died for the last time on my system. Ain't been back to Windows since (other than trying out Windows 10 on a friend's system and instantly remembering why I had learned to hate Windows). Since Steam came to Linux and Valve released Proton, it's all only gotten better by leaps and bounds.