I'm unfamiliar with the 1960's Corvair concepts and I only know a little bit about the EV1 (though I remember reports that the lessees loved them). But the Model 3 (originally named the model E) was announced years before the Chevy Bolt came to market. GM saw the success that Tesla was having with the S & X and knew the model E/3 was on the horizon so they jumped into the game with the Bolt. They've been building cars for a century so it makes sense that that they're much better, or at least more experienced, at building cars so it's no surprise that they were able to beat the Tesla Model 3 to market.
While all reports are that the Bolt is a good car, it's still got the look of a compliance car = boring (IMO). I've always been annoyed that manufacturers (before Tesla) seemed to believe that anyone who cared about the environment didn't like cars. The Prius always pissed me off for this reason. I am a big Toyota fan for their consistent reliability and I loved the technology of the hybrid (obviously a lot of other people did too) but the Prius is about the ugliest, most boring car on the road (again... IMO). Why couldn't they have at least made it look like a Camry or something else that, while a little boring, didn't scream smugly: "I CARE ABOUT THE ENVIRONMENT MORE THAN YOU... SO MUCH MORE THAT I'M WILLING TO DRIVE THIS UGLY, BORING PRIUS!"
Tesla is the first manufacturer that gives me the impression that they understand that people can be car enthusiasts AND care about the environment. Their cars are not boring compliance cars. They are sexy, competitive sport sedans that happen to also be electric. Nobody is comparing the Chevy Bolt to a BMW 3 series but that's one of the most common comparisons that I've seen about the Model 3. So, yes, GM can claim the title of having the first <$40,000 EV with over 200 miles range but it's more of a full electric competitor to the Prius rather than the aforementioned Bimmer.
Sorry for the rant. I hope I didn't come off preachy or negative (your original post was very polite). I guess I have a little bit of a nerve when the Bolt is compared to the Model 3. I get that wasn't your point... simply that GM was first.