system
A chat on subreddit /r/pcmasterrace
human
Find me an accessible and affordable manufacturer that offers pre-built in any form factor without Windows.
gpt
Well that seems like a chicken and egg problem to me. Casual users don't use linux because it doesn't come preinstalled -&gt; it doesn't come preinstalled because the user base is far too small.

I do think there are other issues as well:

1. gaming has severely improved with the steamdeck and proton, but is still not  where it should be for most gamers to make the jump. Case in point are the first party launchers of certain companies that don't even work (without any tinkering).
2. There are too many flavors of distro's for manufacturers to make everyone happy. I feel like this is also an issue with linux in general. To go from casual user to power user you can't always google "my problem linux". You need to dive deeper into the packages installed. The amount of users with the same problem is limited, since not everyone is running the same version of the OS with the same packages installed. Googling your problem is complicated more by distro's changing packages through the years. (Though at that point I guess you do fall into the power user category)