You can develop using it as an SBC, then put it into the laptop when you go to a conference to present your stuff. Or if you really want to code in the park it's not like it'd be a microcontroller, it is fast enough to run an editor and compiler.
I guess from framework's POV there's not much of an argument, it's less "do people want potato laptops" but "do we want to get our feet wet with RISC-V and the SBC market". Nobody actually needs to use it in a laptop for the whole thing to make sense to them.