I wont discount that as a possibility, but it kind of goes against the company's mission, so I think thats kind of unlikely. A more likely explanation (in my mind) is that being a small company, there's a lot more variability of quality in each unit's parts than you would see from a larger company with more mature factories etc.

My partner and I both have frameworks, but mine has had a lot of issues with the track pad and theyve never experienced any.