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There are some statistical concerns with how Israel came up with their numbers, so I would put more faith in other countries results, at least for now. My best guess is that the 64% is for any detectable disease, not symptoms (i.e. you test positive but don't feel meaningfully different), which means the vaccines do their job at quickly eliminating the virus.

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The more important result is although Delta is resistant to being neutralized by existing antibodies, it does not prevent it in serum-trials against vaccinated individuals, the like most biological systems the human immune system is exponential: starting from an effective antibody response, it can overwhelm any nascent infection (i.e. hospitalizations would not be expected to rise).

The number I've seen is a 3-5 fold reduction in the kinetics of neutralization [1] - this is concerning for whether you can spread it, but seems to my eye pretty consistent with hospitalization effectiveness remaining about the same.

[1] https://www.nature.com/articles/s41586-021-03777-9

Maybe. But I was commenting on the real hospitalization numbers and implied vaccine protection from comparing the ratios 1) hospitilized vaccinated vs hospitilized non-vaccinated [the linked spear sheet] and 2) vaccinated in relevant age brackets vs non-vaccinated in relevant age brackets.

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