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Off the top of my head I don't have problem with this, but the topic is about declining scores so I'm not sure how relevant this is.

Yes. That's the whole idea of adaptive/personalized learning.

There are some interesting ethical questions about disparity of outcomes, but we should aim to have a system that educates each individual as best we can (without leaving kids behind). The current system of bludgeoning every individual student to be the same is not working well.

Always used to be the case, is that no longer an option?

Not an option in San Francisco.

Back in 2022 I spoke with the principal of a nearby government-run school. She told me:

- under no circumstances would a kindergarten teacher teach any first grade content, and

- grade skip is so rare that she'd seen it only once in her entire career

teachers not being able to teach 'higher level' content seems like a huge issue.

Absolutely

No, because you’ll end up really dysfunctional if you’re a child in a class with 18 year olds.