In some ways it’s more complicated. The battery management and cooling is a point of failure. It’s also heavier and so wear and tear on suspension is greater.
On the other hand, a Toyota hybrid doesn’t have a gearbox at all, not even a CVT. Instead it has something similar to a differential, it’s mechanically simple and very reliable. It uses the electric motor in place of a turbo, so that’s another common failure point removed. It doesn’t have a starter motor, and the Atkinson cycle engine should suffer less stress than an equivalent petrol.
Practically the biggest problem is finding a 3rd party garage who will inspect the hybrid parts as part of a service.
On the other hand, a Toyota hybrid doesn’t have a gearbox at all, not even a CVT. Instead it has something similar to a differential, it’s mechanically simple and very reliable. It uses the electric motor in place of a turbo, so that’s another common failure point removed. It doesn’t have a starter motor, and the Atkinson cycle engine should suffer less stress than an equivalent petrol.
Practically the biggest problem is finding a 3rd party garage who will inspect the hybrid parts as part of a service.