#ZFS is nice. I've had it, with full root-on-ZFS, since PC-BSD. It took me several years to actually realize how nice it was.
If you want something more arcane than #FreeBSD to play with, take a look at #Illumos, in particular its derivatives #OpenSolaris, #OmniOS, #SmartOS, and @ptribble 's #Tribblix.
Illumos has original Joy+Horton #vi (not one of the clones), the SMF, zones, ZFS, and a fair number of System 5isms not in the BSD world (e.g. sar, which @rl_dane was talking about the other day).
You need a paper terminal for the complete experience, remember. (-:
@passthejoe @frobozz @JdeBP @gumnos
I dunno, I have a vague impression of the #WYSE terminals being "weird," but it's been a quarter century.
Some of the later DEC VTs were dinky, but that #VT100 was LEGEND-STATUS classic. 😄
I literally remember seeing them in pictures and wondering "What is that groovy curved-looking computer??" and only years later learning that that was the ORIGINAL VT100.
I'd lose my mind to be able to play with one of those sweet machines.