Because overall, if you ignore old and new and just analyze both on their merits, I'd say we have rough parity already.
We're not there yet, we will be, but it's going to take some time. The people who say 'electric cars suck' are the same sorts of people who leave negative reviews of a beta product, missing the forest for the trees in my book.
Same goes for the people who ignore critique and offer only praise. Gas/Diesel cars have a hundred years of engineering behind them. Their capabilities exist with purpose, and ignoring that is folly.
So yes, it sounds like your definition of "parity" means it can do everything a gas car can and more.
If electric cars were first, would you demand that gas cars need to be able to power your house to reach "parity"?
I don't think you're using a good definition of parity. Two things with different strengths and weaknesses can be at parity if they mostly even out.