Not true. There were many lesser known Distros like https://en.wikipedia.org/wiki/Source_Mage , or https://en.wikipedia.org/wiki/T2_SDE which survived to this day.
I'd say the latter is running on more diverse hardware platforms than NetBSD, and actively developed and maintained :-)
Portable means just that: "Potentially portable if someone makes the effort."
Which NetBSD didn't in comparison.
And even if, it's lacking drivers for being fully featured.
https://en.wikipedia.org/wiki/Coherent_(operating_system) would have been more practical.
If you had any of the less common things like your mention or mine though, it was pretty good for job hunting. FWIW, never heard of your suggestion (more surprised I hadn't). But a lot of things were word of mouth back then, if not Computerworld, or something like it. I personally liked QNX a sh-t ton.
The last time I touched Windows in a professional setting was about 2001. Yay! Finally! Good Riddance!
Later on I had (by then obsolete) Sparc stations, and smaller pizza-boxes with PA-RISC 7500, or something. And many X86s. I abused my large kitchen as 'Cyberkitchen', having arranged all the systems in one corner, along two empty walls in a right angle, sometimes even shaped like an U. When I came home while it was dark, before switching the lights on it looked like something out of Sci-Fi, with all the status LEDs glowing in different colors :-)
But I didn't have any of that stuff in my living or sleeping room. I've found 'couch surfing' to be uncomfortable/unergonomic, even with early laptops. Always a good office chair, and big, non-wobbly/vibrating desks at the right height, even if somehow improvised.
Didn't do much with QNX, because I only had the demo version. While very impressive, it seemed impractical for my use-cases. Similar for BeOS.
At the moment I feel really comfortable with CachyOS running Plasma/KDE, minus all the gaming stuff, which I'm not interested in.
Absolutely hassle-free since about 2 years, doing everything I need without any lag, in most wacky configuration like ZRAM over all the 32GB physical RAM, on BTRFS.
Plus profile-sync-deamon for holding the browser profile in RAM, too.
And syncing it back periodically to 'disk', err...SSD, making even good old Firefox(or a derivative like LibreFox) fly.
Oh, and working suspend/resume every single time. AHARR HARR HARR!1!!
I preferred Byte, UnixWorld, c't, and iX to Computerworld.
Edit: Since you've mentioned GNU/Hurd/QNX/BeOS, ever heard of https://chimera-linux.org ?
Or https://genode.org ? I find the latter to be a most interesting alternative to things like QNX/BeOS/Haiku. Especially since it has a native port of current QT. But I have been too lazy and spoiled by CachyOS to invest much time into it. Though it does boot into live mode from USB-Keychain on my hardware. Hrrrm. Decisions, decisions...
Pity you abandoned Windows before even winsock/trumpet came out.