It is frustrating to not know what url I have open. Some apps add info based on account .
I feel there will be more sites where the URL won't matter or where the user will prefer simplicity to control.
I use Google Maps 99.99% in PWA mode and never mourned the lack of the URl bar, especially as I can open the site in normal browser mode anytime I ever want the full controls.
Which is basically how it works in Chrome in PWA mode: a few basic actions (get the URL, print, cast, adjust zoom etc) in a menu, and an option to punt it to the full chrome if needed.