Surely they are aiming for a repairable and modular smartphone eventually. That's going to be super hard to do. My guess is their next form factor will be a tablet.
You can install Linux on their Chromebooks, so it would be good to have the choice. Some people will prefer a slightly more seamless Android experience and some people will prefer Waydroid
Chromebook makes sense. They could also do full on Linux. Star labs has a tablet coming out, so they don't have to reinvent the wheel for software (I assume, I haven't tried touchscreen Linux).