I used to use 3270-based stuff at IBM back in the mid-2000s, when I did tech support for their EPOS systems.

They had some hyper janky Windows XP Citrix client that ran 3270 terminals that kind of half-worked on some server somewhere, that then talked to the Big Iron. When it didn't work (it frequently didn't) it meant we got a lot of coffee breaks, so not the worst in the world.