[rootusrootus]

That functionality exists on iOS. When I open a site from Apollo, to use your Reddit example, I get a small "Done" button at the upper left corner of the screen. Touching that closes the browser window and leaves me right back in Apollo where I started.

Conventionally, most iOS apps seem to do it like Apple does with the native apps. E.g. when I click a link in an iMessage, it opens up the page in Safari and at the top left of the screen there is a little "< Messages" button that will take me back exactly where I was.

Honestly, it seems just like a Windows vs MacOS vs Linux thing. There are analogs for almost every behavior that is even a tiny bit popular, you just have to get comfortable with how to use it.