Because they might think they need to use the terminal a bunch when in reality they don’t. They might have the wrong impression about how much terminal work they need to do and use that incorrect information to make a decision. I’m saying they could have wrong information to make a decision which would be an uninformed decision.
That could be the reason why someone is going that direction though even if it’s not an informed decision.
Building off of this awesome and thorough response. There are some games that you might need a different version of Proton for everything to work right. I had issues with Blue Prince not being able to see any videos that played during the game. With Proton-GE, that is solved. So there might be a little adjustment and tweaks that need to be done but I’ve found everyone in the Linux community more than happy to help.
As to your comment about security vis-a-vis open source software. I think that comes from an inherent misunderstanding about what open source software is because I had a similar thought when I was younger. If a program is open source and you can see all the bones of the software, you can see the code and know how to hack it. That was my thinking at least. But the security comes from having everyone able to view the code and patch out vulnerabilities. Closed source just means that you might have the veil of security through obscurity where it takes a little time to have your bugs exploited.
I don’t like flatpaks because they never feel cohesive visually on my system.