I see, renewables will only leave gaps that fit your argument. You don't see any scenario where there could be brownouts during the day, say in the summer when AC usage is high?
And no, using cars for grid-scale storage has not been tried multiple times. The technology has never been available/feasible at a large scale before.
There is an economic case being made above that explains why, you might want to try and follow that and respond on point instead of mindlessly nitpicking.
There exist large scale trials for this idea, you never heard of them because (aside from the fact you are arguing on a subject you know little about) they failed or are barely limping along.
And no, using cars for grid-scale storage has not been tried multiple times. The technology has never been available/feasible at a large scale before.