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It literally is about energy density. You don't understand how many batteries you would need to replace one mid sized nuclear plant. Batteries are not 100% efficient closer to 70% after charge and discharge. A mid sized plant is 500-700MW. A 1 MW battery is a 20-foot shipping container. It weighs about 15 tons and you would need about 1000 to replace the plant and enough renewables to recharge all of those 1000 batteries to get the 700MW back out to note, this would be 1,360,000 cubed feet of batteries, not counting housing, cooling systems, sprinkler systems, or anything else. This doesn't even get into the fact the battery bank isn't producing live load and is only good for 1 to 3 hours of draw till the cells are drained (1 to 3MWH ). While the plant produces round the clock energy. So quadroople your batteries minimum.
I guess the point is that they're working on better batteries, right? Ones that can get better efficiencies and all that? I am not an expert in this area of course, but I'm also not able to build you an SMR, so again, idk what technology will eventually win out (in terms of cost effectiveness or overall viability) I just know it's something everyone's talking about.
Are you the current president of the United States? Because I've just explained to you the exact flaw with this system in detail. And you have glossed over this with a platitude that everybody's talking about it while providing no insight or understanding of the problem at hand, while also admitting you do not understand the fundamentals.
Lots of people talk about world peace. Turns out world peace is hard.