pfdietz said, long term storage is necessary if you want a 100% renewable grid, replying to me saying it's not necessary (though there's some potential confusion around whether responsive demand to make green hydrogen counts as long term storage or not).
Someone else said, that's a big if, since 99% renewable is probably much cheaper.
When they said you can try it yourself, I thought they were disagreeing with that point, which I, and the people who made the model, agree with.
(As another example, the current US strategy is to get to 95% low carbon electricity and then shift focus to electrifying more things, as that has a bigger impact on carbon at that point, and helps to absorb variability.)
