I contracted for an injection molds manufacturer that used Unigraphics from '06 to '22 as a general sysadmin. I was "adjacent" to NX and never really interacted with it directly (though I orchestrated a lot of silent deployments / upgrades).
It was noteworthy to me that they'd so heavily integrated UG (and customization of UG) into their operations. They started with UG back in the early 80s on a Data General machine. I was told they had proprietary "GRIP" code still in use that dated back to the late 80s.
The article came out at the end of 2024 ... these guys must all be around 80 by now.
Edit: Unigraphics X SDRC became the system we know today as Siemens NX