Samsung's DeX software on the Galaxy S10 and Tab S4 lets you run an Ubuntu ARM installation when the phone is connected to an external monitor. I could definitely see the use for a phone that unfolds into a tablet for work stuff, without requiring the extra peripherals.

I'd much rather carry a single device that can do it all, but a 7.3 inch screen isn't going to get me there. I'm more interested in the Huawei Mate X, that has an 8-inch screen when unfolded.