Imma be honest, I deem Tesla successful. At start, their mission was to get EVs started up and going. And they fucking did. After showing how much can EVs achieve, they forced whole world to shift focus - they succeeded.
As of what happens with the company now...I don't care. They did hella lot of good for everyone, now they can fall off. Would prefer if Musk fucked off instead and let them cook, but eh.
I disagree. EVs needed more battery development which occurred largely independently of Tesla, and instead they just reaped the reward of other people's labour.
Technology wise, true. But it's not about technology. Tesla pushed for EVs to become mainstream. They made them wanted by people. Up to that, automakers ignored that tech fully, cause money was with ICE.
You can't deny the impact that they had on propping up EVs as desireable, though. There wouldn't be so many Teslas on the road if the opposite was true.