You should do what better fit your usecase.

I don't know how large is framework's market, nor how deep their pockets are, which condition their ability to produce 2 different models.

It's clear that a modular design is preferable, hopefully once a standard emerges they will use it in their next devices. Perhaps framework will help in that process, but I don't know if they can afford to put up with the initial costs, particularly in a market they don't have a strong foothold yet.