There are reasons to buy a PHEV even if you never plug it in. Their electric motors tend to output more power than HEV versions of the same model, leading to more performance and a quieter drivetrain (even with the engine running, it doesn't have to work as hard). You can also run climate control and infotainment while parked without having to idle the engine, which is nice when waiting around on a hot day. Or you can remotely start the air conditioner with your phone.

Basically you can get EV quality-of-life features on a gasoline-powered vehicle.

I probably wouldn't recommend a PHEV to someone who doesn't have a place to plug it in every day. But there are reasons to buy a PHEV beyond just fuel efficiency.