Not even who you're asking, but I'll preface this by saying... I'm a big fan of Proton.

With that said, non-working games are fairly common. We should be clear about this; either they don't work at all, or don't work well.

Personally, the biggest 'not working at all' game would be Destiny 2. I bring back my VM with a passed-through GPU occasionally for it

At risk of arguing their merits, certain anticheats just simply aren't compatible

I don't have many in the 'don't work well' category... but my PC is ridiculously overbuilt. There are certainly inefficiencies

Whenever that happens it's often a Wayland problem and not a Proton problem

Agreed.

There are only two windows machines in my house.

1. work laptop

2. gaming machine

I tried converting the gaming machine over to Linux, but it's just not there yet. It's making huge strides and I'm super happy about it, but claiming that most or all games run on Linux is waaaaay overstating the reality.

Thank you for the confirmation and support! I love where Linux gaming is going, but we really should be honest about it.

The easiest way to leave a bad impression on newcomers is... telling them one thing and having them see the exact opposite.

I recommend giving Linux a try, it's way more capable than it used to be. With that said, pack a parachute - you probably will find yourself needing to switch at times.

Not every game is on steam..

Modern titles with heavy handed anticheat don't work well on Linux (and likely won't ever). e.g. Modern Warfare 2 is classed as "borked"[0] in proton.

0: https://www.protondb.com/app/1938090/