Why is this argument so common?

Because for decades every sincere attempt to suggest Linux as the solution to some problem was 80% of the time met with “but muh games”, so now people make the assumption that it will be the likely objection when it comes up.

You seem to have a corner case that requires you to use Windows even if you did prefer not to, and that’s totally valid.

I’m 17 years in running Linux on everything at home while being paid to support and deploy Windows at work, and my trajectory has been that each and every one of those 17 years MS has given me reason to be really happy I left them behind. Lots of other folks have similar stories, and it’s only natural that they want to share that enthusiasm with folks who are pearl-clutching about however MS has shit on their users this month.

Personally I think there are more users who could go my way than who are likely to have a corner case such as yours. (I barely even consider HW compatibility anymore for common devices except of course avoiding a very short list of wifi vendors.) But I also recognize that is my perception and anecdote and I couldn’t support that assertion with any particular data.