If those Windows users did switch over to Linux, it would have a significant impact on the % of Linux users. https://store.steampowered.com/hwsurvey/Steam-Hardware-Softw...
Hopefully "Steam deck runs Linux" is enough to persuade people to try Linux.
But still, people will eat what Microsoft feeds them by the spoonful, and ask for more, regardless of the quality.
Consider the competition; what OS do you get with an apple machine? I dunno, whatevers current. What about a windows machine? Probably the most recent one but if you dont like that you have at most 2-3 other options you'd realistically entertain and they just arent that different - the more recent ones are considered to be worse broadly speaking so it isnt a very difficult subject to get acquainted with.
Contrast that with linux in which a question like 'whats a good distro for a beginner?' is likely to start a flamewar. A prospective user is essentially asked to developer a level of expertise and buy in before getting started that the competition does not require.
Im guessing that this will offend you so I want to make it perfectly clear - this isnt a value statement, just the recognition that friction in onboarding causes people to leave. This is just human nature, there are likely a number of choices you make that boil down to expediency that others would characterize as 'eating whatever was offered by the spoonful and asking for more'.
This is quite accurate, not sure why you would think it would offend me.