[vayup]

The strongest arugument made is that hybrid is more complex, more work and therefore more risky.

As someone who has been implementing such systems for 20 years, I don't buy this. In my mind, it's equivalent to saying "Seatbelts add complexity to the safety system, and it's more work. So let's get rid of it."

In this argument, the benefits of hybrid/seatbelts are not factored in adequately.