Yeah, Phosh is probably one of the better options right now, especially for smaller tablets. It's still very much focused on phone-sized displays though.
There's some concept art[0] for a tablet/laptop mode for Phosh with tiling window management, but so far it's just a concept. (It's one that I'm a huge fan of though and that I hope will happen; I'd absolutely use it with a docked Librem 5.)
That video shows Phosh on a larger display, which is fine, but it's still just the phone UI blown up onto a larger display with floating windows. I've used it, it's okay, but in its current form it's not something I'd want to use long-term on a laptop or tablet.
The UI shown in that concept art is still just a concept. The notification center and calendar that slide in from the sides, the combined tray/clock/launcher bar at the bottom, the touch-friendly tiling - none of that exists yet.
There's some concept art[0] for a tablet/laptop mode for Phosh with tiling window management, but so far it's just a concept. (It's one that I'm a huge fan of though and that I hope will happen; I'd absolutely use it with a docked Librem 5.)
[0] https://www.omgubuntu.co.uk/2020/04/gnome-mobile-convergence...