I use PWA a lot. I added the Steam chat as a PWA to my taskbar, apart from the Steam client itself, it's fast and reliable. the top bar is also very useful. it's Super tiny (maybe only 5px) and doesn't cover much of the screen size but it gives me very useful functions like back button or access to my extensions. without it i wouldn't be able to utilize PWAs so much. in my opinion they shouldn't completely remove the to bar, no matter tablet mode or not. they can however add an ability to make it hide automatically like hide taskbar feature in Windows 10.