I wouldn't say it's useless or unhelpful. I'm simply saying it like it is: Crostini was not made to run games and most games simply will not run with it. If they're not able to figure it out on their own (Linux is an OS where you'll have to figure out a lot of things for yourself), the best option is to use a different OS. Don't get me wrong, I love Chrome OS - my daily driver is a Chromebook! - but it's quite clear that they were not made with the intent of them being used for PC gaming.