Third party companies could make compatible parts.
I look at this laptop as a proof of concept for something we should all want to exist: a modular and repairable laptop. Just because it isn't perfect doesn't make it bad.
I was enormously skeptical when I first heard about the company, as the history of computing is littered with the devices and prototypes of startups that suggested they were going to make something different and open and extensible, only to have those promises be completely overblown, and usually have communication become shady and vague. But while I'm not quite confident enough to buy one yet, and I'll be very interested to see how their ecosystem evolves over the next few months, it actually looks like they might be succeeding here.