Because desktop Linux is an absolute bloody mess and most IT departments are completely justified in not wanting to deal with it?

I’m not saying that Windows is great. I haven’t willingly used it in 15 years. But you can’t keep your head in the sand about the sad state of Linux and anything graphical, especially on esoteric hardware.

POS systems are often effectively Internet-connected, because they need to report stock levels, connect to financial networks, process BNPL applications, etc. it’s completely warranted to treat them like ‘endpoints’, because they are.