2. It has no "next/previous/highlight all" etc. buttons (it still have these features, just no clickable buttons)
It still makes no sense to me.
I guess maybe a small portion of people would find the auto-disappearing thing useful, even though in normal Ctrl+F all you need to do is pressing Esc.
But the second "feature" totally baffles me. It's not like Ctrl+F is some expensive GUI to launch, why would I want to not have these buttons? Even if you don't need them at all (I don't), you can simply not click them, there is no downside by having them.
I had the same confusion with his comment but I think what he meant was that when you highlight a result in a link, pressing enter causes you to follow that link (which is true). You are correct that ' focuses on only searching within links though.
Enter never goes to the next result though, so I am not sure if that is just something different between his setup and mine. I have to use F3 to go to the next result.