Could be any of several reasons. As a backup plan, for niche uses, or just uses that you are not considering such as small aircraft. Could be a stop gap as well

Could be any of several reasons. As a backup plan, for niche uses, or just uses that you are not considering such as small aircraft. Could be a stop gap as well, it seems like there was a quick uptake in EVs but they aren’t replacing petrol engines just yet, even in cars.