"comms going awol at ATC handover point is too much of a coincidence"
I think this "coincidence" is why many think whatever led to the disappearance was on purpose. Whether it was or not, it seems the cause modern airliner crashes is often a series of unfortunate coincidences. Otherwise, they'd be no crash. Mechanical, human, and/or weather, coincidences are the holes in the proverbial Swiss cheese.