tbh I don’t really see the point of buying something by Microsoft just to install Linux
if it was possible, it’d be like buying an iPhone to install Android. You must’ve had a very good reason I guess.
P.S. Just checked what the form factor of a Surface Pro 6 is, and I think you’re right when you say there are not many alternatives. Also, it’s a pretty old device so it does make somewhat sense to me. Not that it matters, you can install whatever you want on your stuff lol