You are completely failing to grasp the level of tyranny here. Schools these days often will not accept non-Chromebook devices.
'trusted' computing is tyranniclal, petty managers and school boards exploiting it is its intended use case
Even in college, we had a freshman year computer requirement where we had to have a Tablet PC. Freshman engineering classes all used a Windows-only handwriting application for class participation. The Tablet PCs they sold at the time were expensive and crappy. Luckily the application worked in Wine somehow and you could get by using a cheap Wacom tablet so that's what I did. I sold the Wacom to another freshman so they could do the same. Eventually I bought a used Thinkpad tablet PC because I actually liked handwriting my notes and homework but I hated the fact I was almost forced to.