None of that argument justifies your claim. Yes, storage is needed. No, that doesn't mean solar cannot power civilzation. Simply raising questions doesn't prove your point. It's up to you to show that all the various storage technologies, alone or combination, along with transmission and dispatchable demand, cannot do the job.

No, it IS about whether it's possible. You didn't claim it wasn't "efficient", you claimed it wasn't possible. "Can't." I'm not sure why efficiency matters -- is agriculture impossible because its average efficiency at converting sunlight to food energy is less than 1%?