Let's put it this way: Would Panasonic have achieved just as much for EVs if it had made the partnership with any other carmaker?
To me it's been obvious that the other carmakers were dragged into the EV race, and they would've rather not see it happen at all. It's quite hilarious seeing around the time the Model S came out and soon after, how the other car makers were still "one-upping" each other with 65-mile range, 70, 75, 80 - by continuing to repackage gas-powered car platforms into EVs. And those were the "full EV" versions, not the hybrid ones or whatnot. Those still had like 20-30 mile ranges in their batteries.
I think it would've taken at least another 15 years until one of them would've decided to just rethink an EV from scratch. Their love was status quo was all too obvious.
There are some who say Apple is Messiah on Earth and they've invented all smartphone features and they deserve to ask $2,000 for an iPhone (see latest iPhone thread for such opinions). I completely disagree with those, even though I was one of the "fanbois" preaching an iPhone in the "Nokia is still king" days.
And then there are others who say Apple invented and innovated nothing. zero. nada. And the smartphone industry would've progressed in exactly the same way without them, too. I say that's also bullcrap. Not only did Apple completely change the mobile phone landscape, but it has pretty much changed it every year afterwards (see the wave of "retina displays", or fingerprint auth, or 2x optical zoom from last year - all being adopted at a rapid pace by everyone soon after Apple did it).
I see opinions about Tesla split the same way. In my mind, Tesla is the first successful car company in 100 years to not just exist and survive but to reshape the car industry. They haven't invented everything either, but I give them a lot of credit for the awareness EVs have now (and will have in the next few years).
I guess my point is you don't have to have extreme opinions about a company in order to give it the credit that it's due.