For instance the address bar on here is a canonical truth and is the linchpin of the experience. See how every time a browser touches it (e.g. Chrome truncating the address) is met with mobs of the angry. Many users -- including even "power" users -- seldom interact with the address bar. Nor is it verification of anything much. It simply isn't that important anymore.
Another comment mentions that the reload button is two clicks away, which is a fair point but that everyone who actually uses reload (generally developers -- zero web apps should ever require the user to hit reload) use a keyboard shortcut.
Eh.
"Certain UI changes in macOS, Windows, etc. are so obviously bad (and are eventually changed)"
True. At the same time, every UI change of anything ever has yielded a firestorm of criticism and pushback. And more times than not the new design was better and people acclimate to it and eventually prefer it. I judge nothing on initial reception.
I interact with the address bar every time I go to page or site. It is my single most interfaces with the browser after the sites themselves.
And that it isn’t much use for verification is exactly the reason why people advocate that it should display all information!
Because it is. Ultimately, your comfort is the only thing that matters when you're using a computer (particularly Macs). If something doesn't operate in the way that you want it to, why is that not a valid argument for replacing it?
Edit: point proven
I actually didn't know iOS had this, I only know about FireFox on Android and it asked me if I wanted to opt in before thrusting it upon me. That's a good way to make major UI changes.
Thoughts maybe, but did they ask users what they wanted? Did they run usability studies to verify that these changes make sense? I can't imagine that they did. Certain UI changes in macOS, Windows, etc. are so obviously bad (and are eventually changed) that no matter how much they thought about it, they didn't care to check what users thought.