Yeah, we argue this all the time :) you can’t stick hydro storage just anywhere, yet you can ship cargo containers full of powerpacks to anywhere in the world in a week or two. The Hornsdale Power Reserve was built in 90 days. Tesla is building a 700MW-1.1GW facility with PG&E to replace 3 natural gas generators (in the Southwest US, solar and batteries are cheaper than natural gas).

Utility scale battery storage will lead the day. Raw materials go into your factory, out come battteries good for at least a decade, that can perform energy arbitrage and frequency response for grid services. And every year it keeps getting cheaper to build. Hydro storage construction is always going to be geoconstrained, time consuming to construct, and expensive.

Just my two cents.