There are a gigantic number of people whose university or corporate IT department installs Linux for them on standard issue hardware which they use every day fo

There are a gigantic number of people whose university or corporate IT department installs Linux for them on standard issue hardware which they use every day for their job. E.g. big companies whose programmers all develop on Linux machines, or most academics in programming-adjacent fields like statistics or machine learning. Another category is people who installed it themselves because they like it better, but for non-ideological reasons. Like, a large chunk of programmers feel much more comfortable on Linux than Windows. (I’m not sure what to make of your point about dual booting — it’s hard to believe anyone would “not care” about having to do a full reboot every time they wanted to do something as common as view an office document. Now “let me finish reading that interview candidate’s resume” goes from something I can alt-tab to while compiling into an ordeal of saving all my open work, rebooting, downloading and opening and reading it, rebooting again, reopening all my work...)