I sort of get it, I do use vim and only very recently switched to nvim. For some reason the web UI here just seems different to me - because the rest of the web you would be using has changed around it, perhaps. Maybe it's just not really used much at all but still exists I suppose, just because someone posted it here doesn't mean anyone's using it.
vim/nvim are still heavy beasts.
Here's a recent example which made me laugh: 2 months ago, a "shortcut" for reverse search was implemented in acme[0], a 30 years old text-editor. It's not even qualified as a "feature" yet, rather, as an "experiment"[1].
Every little decision is carefully weighted; every square inch of the software is carefully and precisely designed. Japanese wooden planes are similarly designed: they don't look like much, especially in comparison with more modern, shinier tools, but they're surprisingly well-thought.
[0]: https://en.wikipedia.org/wiki/Acme_(text_editor)
[1]: https://github.com/9fans/plan9port/commit/0c79c32675e83ff3d8...
There are strong mindset differences between various software communities; it might takes a little bit of time & effort to appreciate a more frugal/conservative approach to software engineering.
The previous links highlighted some aspects of those mindset differences. [0], while unrelated to OpenBSD, is another good illustration.
That's to say, OpenBSD people probably don't care much for a more featureful experience: it won't make them more productive, even if it may look like it would from the outset.
[0]: https://rachelbythebay.com/w/2011/09/24/editor/