Does Washington do standardized testing on kindergartners or first graders? If not, I agree with your claim that there’s no evidence [in any direction] to test this specific hypothesis most precisely.

I agree with (what I believe is part of) your position that lack of money isn’t the sole (and not even primary) problem in our schools. More money alone won’t fix anything. Maybe it’ll bring back music or other specials that some kids like, but money alone won’t put our education on par with Switzerland, China, or Singapore.

It’s also probably true that whatever is actually needed will also need money, at a minimum in the transition period. It’s a necessary but not sufficient input.

Absence of evidence is not evidence of absence, plus citation needed.

Not to mention that you can only know whether the foundation improved after you build on top of it... which is something we can only observe in the future.

Note that I am not saying that you are incorrect in your assessment. All I am saying is that it's too early to know one way or another.