This is simply false. A lot of fields use specialized software that is only available on Windows and sometimes macOS. For instance, my wife works in neurolinguistics where most standard software for doing things like analyzing EEGs is for Windows.

However, I agree that this may be true in other branches of education. E.g. in our daughter's primary school they use Chromebooks. They are used as glorified 'web terminals'. I can see why a mutable Linux distribution would be awful from a maintenance perspective, but an immutable Linux system like Fedora Silverblue would probably work as well as ChromeOS.

This is also a failing of the Dutch government and the EU, leaving things to the market, rather than taking initiative and making a standardized education platform.