How much of this would feel addressed if a button was added to copy the URL to clipboard? Obviously, it would not fix things like being able to manipulate the URL in the field (/page2 to /page3) or get rid of utm_source cruft, so it would still be a net loss.

But would you consider that a tolerable loss, or still too much? (I think I'd say it's still too much, but I am also a web dev and thus a power user.)