I dunno about all y'all ...
... but when I set up an R&D lab, the network is airgapped. Not just from the outside world, but from the rest of the company as a whole. There are some networks that you really, really don't need or want to be available from the outside. For a lot of reasons.
Yes, I know, some damn fool of a manager will probably find an excuse to have access to the R&D network from his/her desk, but that's out of my control & happens AFTER the company in question signs off on my design and implementation. Sometimes I even get paid to fix it after said dimwit manager breaks it.. heat wan't broken when I
Non-R&D test equipment doesn't need fancy stuff like network capability in the first place. Neither does most R&D equipment, but what with people thinking autonomous vacuums should have Internet connections, cameras and microphones these days, who is going to listen to me? It's ugly, but it's a living.