According to Powers Report, hybrids have worse repair records than EVs or ICE vehicles.
One of the biggest issues is the off-and-on of the engine and the lack of oil each time it starts after driving on battery power. It is the equivalent of a cold start each morning because the oil cools down and drains away from the critical parts.
Also, the oil does not get hot enough to boil the water out and thus becomes contaminated. In theory, it sounds great but in reality, the science is not there. An electric oil pump would help if it came on when the engine shut down but an oil heater would also have to be added both running off battery power. Are we starting to see the solution is ICE vehicles?