Yeah I think the main issue with PHEVs is essentially that people don’t charge them / do the majority of their kilometers / miles on the ICE engine :). See https://theicct.org/wp-content/uploads/2022/12/real-world-ph...
The battery was dead when I picked it up. It was dead when I returned it, despite me actually looking for a L2 charger just to see what it would be like to drive fully on battery. It did drive as a hybrid (I could feel the ICE stop and start) but it wasn’t nearly as efficient as it could have been, especially considering my entire rental was probably under 100 miles.