Yeah, I'll pop in and watch one sometimes, but I was like, a shirt buying, subscribing, pod-cast listening fan. And I really enjoyed his show with Brady. But it felt like all Gray did was talk about productivity, and like... no content was coming out. Granted this was many, many years ago. It does look like the recipe is still working, but there were times where it would be.. months, almost years between pieces of content. Which was at odds with the very early under-produced days. But I found the obviously scripted and overproduction involved the post, the forced-ness of it all very off putting. I would put the demarcation at pre and post "Humans need not apply", which I still think is probably the best video they've done. And that video was 10 years ago.

Hexagons are really not better than triangles.

I kinda do agree with out on fractal geometry though, (although you're gonna see a lot of tiny triangle shapes). And also for certain applications, things like catenary curves are ideal.

I don't think 90 degree surfaces are going anywhere though. Having angled walls would be less space efficient, and angled floors would be a safety hazard. And cubes/rectangles are by far the easiest, most compatible shapes to efficiently design with. Although in your hypothetical future I guess we can just use the biocomputer superintelligence to design everything.