Hybrid drives are nice for eco freaks who don't research the toxic manufacturing processes of batteries, longevity of that toxic battery bank and the simple fact that 8kw is 8kw, and 8kw isn't enough to move the boat without the battery.
Besides, 600 miles out is not the place to be for a complex drive failure. Simple works or can be grease monkeyed to repair. "Anybody got a spare zener diode part number a-15-34.q" is not going to have many response on the
VHF net in Bora Bora.
It's just not ready for prime time.