This would have been more than a decade ago, so I believe you if you say it is pretty good nowadays. Might check back. I know Discord runs OK on Linux.
Now I can just play the Windows version through Proton. I hope that if Linux gains traction Proton becomes unnecessary, but I'm happy that Proton came as far as it is. Honestly, to play old Windows games it is probably better than Windows.
A few games required some minor tinkering to work, but have been pretty smooth here. If you enjoy playing the latest AAA (that probably takes a while until it gets supported), I would say that you'd better stay on Windows. Otherwise, Linux is more than a viable alternative right now.
With dx12 and vulkan its mostly up to what platforms do you want to support. As they do things quite similar. While you need vulkan for switch you need dx for Xbox. PS has its own API.
Tldr opengl is mostly irrelevant today for bigger titles and that's not what's blocking titles from supporting Linux.