Almost certainly why nearly all hybrids have been parallel hybrids up to now. What is changing, I think, is that a significant number of people are warming to the idea of a BEV, and want all of the benefits of that, but want to fall back on gasoline in a pinch. Thus EREV, or series hybrid, which provides that crutch. Expensive, though.

Which is ~enough to cover the vast majority of commutes, and the majority of US commutes.

Keep in mind that even if 20% of your commute is done on petrol, the other 80% isn't.

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[1] Yes, there are PHEVs with shorter ranges, but those tend to be weird luxury models that for some compliance reason have a battery strapped to them.