You might be right. Having also spent time with the Cosmo Communicator, I can vouch that a phone with a keyboard isn't the same thing as a phone-sized laptop. Apart from the hostile platform (which hopefully wouldn't be an issue on the PinePhone), two aspects that make the phone less practical for desktop software are the extremely high aspect ratio, and the lack of any sort of mouse input beyond poking at the screen. These things significantly compromise the desktop experience.

However, I will also say that a touch-type keyboard on a phone is still awesome, and I will certainly be buying a PinePhone+keyboard when it comes out. I live in forlorn hope for the day I can evict Android from my life entirely (the Micro PC does not, alas, make phone calls).