I do see more benefits of the hybrid argument for mid size power
Cats that hang close to shore, at least on some points. Running several, smaller generators, that no longer need to be located in the engine room(s) appears to me to have an advantage over two large diesels (with their associated running gear) sucking fuel every second the boat
is underway. System monitors can fire up or shut down as many gens as necessary as power demands increase or decrease. And it matters not which gens run, as both motors can be powered from any, or even a single
power plant. It even has the benefit of built in redundancy as losing a generator
for whatever reason means only giving up a bit of top end speed.
Obviously, I understand any weight savings by ditching those big twin power plants will more than likely be negated with the increased number of generators and increased battery
capacity, but still... having smaller, gens that can come online as needed, running at optimum RPM
the whole time instead of constantly throttling up and down seems like it has to have some benefits. The least of which being fuel savings.
Hypothetically speaking, if I were currently in the market for a 40'-50' power Cat and could haver one built and equipped from the get go with multiple generators and dual elect motors, at a reasonable cost over a conventional setup, then I think I'd seriously consider taking a closer look at hybrid propulsion