Well, recently I stumbled upon some discussion about the TWS on Reddit:
Now it is at least clear to me that the development effort was probably not too big, however I still don’t understand the concept behind this. Is this just to have an excuse for the missing headphone jack? Would be interesting to see if the “original” headphones are just as friendly to their batteries as the Fairphone ones claim to be or if this - next to probably other materials - is a differentiator.