>still be a product that you'll only buy if you put sustainability over performance/convenience
That would product that I and countless others would be gladly willing to buy on the smartphone market.
So are you buying a Fairphone right now? Because from my rough estimation Framework and Fairphone are about the same when it comes to performance/convenience tradeoff right now.
I mostly focused on the "YC disruption" part in GPs question without considering whether there is actually an opening for a disruptor. I think Fairphone may already be filling that gap.
At what price though? There are many people who say they would buy a phone like Fairphone, but not at that price, or not unless it had a 3.5mm headphone jack or a better camera, etc etc. Talk is cheap but sustainable phones are not.