If they are networked I can definitely agree.
If not, the only functional difference you get for upgrading is exchanging the floppy drive for a usb port.
It’s really hard to convince people to replace a 6+ digit piece of machinery all because its control system has an EOL OS. Especially considering upgrading it to the newest model most likely means upgrading the OS from Windows 95 to Windows XP (embedded).
If it was Linux that had open-source software that could be updated independently by forking it, then this EOL BS would never be a thing, but nope, proprietary stuff gets execs get hard as rocks
Some stuff these days actually runs on Linux.