As long as the book-keepers keep speccing IT systems, the wrong tools will keep appearing in the wrong places. And even when you have control it's a challenge to do well.
I have seen disastrous OT setups built upon DOS, Win98, XP, OS/2 and myriad others persisting decades beyond their intended service lifetimes in industrial control systems. Either as a front end HMI, or actual processing/decision making.
Of course, in world of air gapped gear, updating is a rather different affair to on toxic internet; however; when a modern solution to a problem inevitably revolves around throwing a wifi router into the loop of those old systems...
New stuff is arguably even shorter lived and harder to patch manage without risk; because of course an awful lot of new stuff includes shiny fan dangled USB. (See Stuxnet and the air gapped Siemens PLC's infiltrated by USB). See also, new suppliers want to sell you new stuff so enforced obsolescence through patch management is a thing.
Easy to poke holes in the problems. Rather more difficult to do anything about them.