If it's a full-screen in-app webview, there's a Done button on the top-left; alternatively, you can swipe back from the first page in the webview and it will close the webview and leave you where you were.

If it's a card webview, just swipe it down from the top edge.

> Switching between the two is very jarring.

I think that's the crux of the problem. Someone who's used to one style and has built muscle memory and some kind of hierarchy and ontology of the interaction with the system will have trouble with a different paradigm. That doesn't necessarily mean there's something wrong with either - they're just different, and some people will prefer one over the other.

Switching between GNOME and KDE, or vice-versa, has a similar effect.