That happens literally every night though and wind also doesn't blow 100% of the time.

Very true, but the fact that wind blows often and there's also varying amounts of direct sunlight during the day already massively decreases the amount of storage required for a grid. You don't need the capacity to cover 100% of energy usage, sustained, like you suggested earlier. Especially as grids become (geographically) larger and smarter — we need wind and sun somewhere to cover energy needed elsewhere — it doesn't have to be localized. Plus solar output obviously peaks during the day, when demand is also highest.

Renewables make up a trivial* amount

The percentage is absolutely not trivial today. Especially considering there are multiple large grids today that can easily sustain 50%+ renewable energy over sustained periods. And 30% by 2030 is a lot, though of course it could be a lot better.

and as we phase out fossil fuels, the requirement for energy storage is going up drastically.

Yes, no-one is arguing otherwise.

30% is NOT trivial lmao

Do you know what else decreases when the sun goes down? Power demand.