This is where the argument goes off the rails.
Nobody could foresee that the binaries would not work, let alone for this long,
And are you seriously suggesting Jolla to walk back on their promise of support (however premature it may have been)?
But perhaps most importantly; if we agree that the IV is somewhat of a bonus to the V - how can you then seriously argue that the V-VI relation is so different that it warrants a completely different approach [i.e. would have been better off not having done any work at all on the IV and V]?