Now that people are discussing it, I do want to find out if there are former air force pilots reading this who can corroborate or refute my hypothesis: I suspect long-duration mission bombers like the US B-52 and B-2 have pilot seats especially tuned for extended operational comfort, even more so than commercial airliners (passenger or cargo), and it would be interesting to test my hypothesis that those would make excellent office chairs for coders. Someone makes these from old pilot seats [1], but I'm specifically interested in pilot seats from airframes that routinely perform round-trip trans-Pacific routes.
I personally wouldn't routinely use such a seat for more than say 10-12 hours at a time, but if it is proven to still be comfortable after someone uses it for that long, naps for a couple hours in it, and uses it for another long session, then it is likely going to feel very comfortable to me. And maybe the safety harness will help me maintain my posture instead of having to remind myself every half hour to check it.