It's not to say that the specific implementations Engelbart was working with were good. But I'd point to Plan 9 from Bell Labs as a kind of hybrid between Douglas Engelbart's vision and what Xerox produced. It's a little alien, but relatively easy to learn, and at least conceptually it shows that an unstructured UI made up of hypertext and windows can be quite nice to use. When that's integrated with the primary IPC mechanism of the operating system, which also happens to be the filesystem, you end up with an intense synergy that's hard not to be delighted by. I don't think it was possible to avoid computers becoming digital filing cabinets, but I also don't think we should write off moving beyond this era at some point. There is a large, underexplored dark wood. I am very interested in what lives inside. I think revisiting Engelbart's ideas of human augmentation with a prolog-based system like the Japanese Fifth Gen Computer project has extremely promising implications.

-Bill Gates

But I also recall attending a Techcrunch party at Mike Arringtons house in 2006/7 or so that Engelbart showed up at briefly, and how fun it was to see him instantly surrounded like a celebrity, so I think you're righ he was recognised in the circles where it mattered.

Edit: found this comment from hn a few years back with a link: https://news.ycombinator.com/item?id=38584517

Apple was founded because HP didn't want Woz's ideas for what became the Apple I.

Fortunately, Jobs thought he could sell it.

https://dougengelbart.org/content/view/209/

Why on Earth are you defending lazy AI slop? Although, I guess I shouldn't be surprised on a Y Combinator message board.