I have used CP/M, RSTS-E, DOS, RT-11, some oddball one-offs on systems from the 70s whose names I can’t even remember. I’ve toggled machine language loops into System/360 processors via front panel switches to isolate bad core memory planes. And honestly, I don’t miss a damn one of them for daily use. Sure, I’d love to have a PDP-11 sitting here so I could wander through Colossal Cave again — it’s just not the same at anything more than 9600 baud — but that’s just nostalgia. I doubt I could really sit through more than an episode or two of Johnny Quest, either. I have an E6B I’ve mostly forgotten how to use, and I really don’t care.
There. Is there anyone I missed offending?
I would pay good money for a 2030 or 2040 front panel to hang on my office wall, though. Bonus bucks if it came from an ex-Army frame.