Well, actually it did and does. It's just very limited in range and speed so it's not practical, full-time electric only propulsion, assuming you don't go everywhere in reverse or under 21MPH.But the original Prius design didn't involve all-electric operation.
The Prius' parallel-hybrid powertrain, with gas and electric motors running at the same time, would be supplanted by a serial hybrid design, with an electric motor delivering about 40 miles of range before depleting its batteries, at which point, a small gas engine would kick in to generate more electricity.Well, "supplanted" may be a bit of an exaggeration but that is a mostly accurate description of the two technologies. however over simplified and incomplete.
So the rest of this thing is why this guy is so psyched for the Volt over the Prius he's had for a year. And you know what? I get it. Chevy let him drive a 2016 Volt around for a week and it probably was a revelatory experience for him. The Volt is an impressive vehicle and for some owners' use patterns, it's literally the perfect vehicle. Which is to say nothing bad about Prius. Prius has its strengths as well which, you don't really get reading, if can call trying to sort out this guy's word salad reading, through this article.
In the end, I'm not sure he makes his case. I'll say this much. Both cars have a lot going for them. Depending on how you use them, you might prefer one over the other.