I guess it becomes a question of what's more important, the page content that the user has navigated to, or the ability to navigate to or from page content.
I can’t stand when apps do this on Android. There’s already a nav bar built in to the OS on the bottom. Let’s not add another bar on top of that one.
Feedly, I’m looking at you as an example. Brave also did this, but after some outcry, created a user setting to show or hide the additional toolbar.
Ya ugh Feedly doesn't have one at the top gulfran.
At least in part because of the invisible dead-zone in the bottom of the browser viewport on iOS that triggers the browser toolbar to appear: https://medium.com/@eventbrite/mobile-safari-whyyyy-73cf61039047