Dissenting opinion: Nostalgia is a drug, kids...
I don't agree. I do feel nostalgia for my old computers, but they were ancient crap and modern crap is much better.
Workstations were just high-end personal computers, before IBM co-opted "PC". I learned UNIX on an old Sun pizza box. That machine was a beast at the time, but it's tiny compared to my current machine. SGI did awesome graphics, but my middle-level nvidia card blows it away.
I don't pine for old tools. I might want to keep around an old hammer, but that's because my Dad owned it. I do watch Vintage Machinery on YouTube, but that's because the old kit *is* demonstrably better than current stuff, and Keith Rucker is rescuing and refurbishing it to modern standards.
Of course old UNIX kit is worth a ton! So are old toy cars and Star Trek model kits! That's how nostalgia works. I had a roommate in college that kept a PDP-11/34 running, complete with a couple of RL-02 drives. He spent more time chasing up broken point-to-point wiring in the backplane than he did being logged in.
Linux has the same Windows-ish desktops all over, because that's what the developers know, and they don't know anything else, so that's what they write. CDE had the "advantage" there wasn't anything to crib from.
Fucking Sun NeWS. That was so very nice, but Sun decided to smother it under a blanket. It's one of the few computer things I feel a genuine loss for. One of the many reasons I'm glad Sun died horribly.
I still have to use Solaris at work. It makes me so happy I have Devuan at home. With Solaris, I feel like I'm using sandpaper wrapped around a block instead of a battery operated high power orbital sander. They do the "same thing" but one is so much better to use and does such a better job.
And YES, at least once a month I regret giving away my TRS-80 Model I (my first computer) and huge range of Atari kit. But that's just nostalgia. So is keeping track of the fact I'll have gotten that TRS-80 43 years ago this Christmas.