But I can personally speak to at least one aspect, having worked for a company that does high end web sites and strategy for large SaaS products, and also being the target audience for such websites (director or VP Eng): the speed and ease with which I can find what I want (as a potential customer) using that top navigation menu is superior to anything I've seen done so far.
I could see immediately they have 34 products under 7 categories; 5 are popular, 4 are new. If I want to try out one: Docs > Product OS > Integration > Install and configure > Install PostHog.
And if I wanted to learn a bit about their engineering: Company > Handbook > Engineering > Internal Processes > Bug prioritization.
Pricing: Pricing calculator > select product > set usage, select addons.
Each of these interactions took only seconds. And I could switch between the product overview page I opened earlier and the pricing page I just opened, without waiting for any entire website to reload (or having to right click, open in new tab, and then scroll).
As I said, there is something here beyond just aesthetics. And one of the conclusions may be that our current UI/UX philosophy has inadvertantly become user-hostile.