Not to mention LTS versions of Windows exist. Sure, Windows isn't as good about them in some situations, but pretending there's zero long term support for Windows is a bit dishonest. I got nothing against someone running either, just seems a bit silly to use ChromeOS when better options exist without being tied to Windows (different distros).

I'd be more worried about the build quality of the Chromebook and that lasting more than the OS to be honest, but never had one so no idea how how well they last physically. Not to mention you can almost always find a better, used device (just not a chromebook really) that will work much better, have its own storage and more than likely last longer than 3 years if you know what to look for.