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actually, the polio vaccine doesn't have much higher efficacy, and the covid vaccines don't have much lower efficacy, they have similar efficacy in reducing severe symptoms

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That's not what the referenced links says. It says the polio vaccine has 99 to 100% efficacy. The published numbers for Covid vaccines show the virus vector and mRNA vaccines are around 95% efficacy. That's a large difference.

that is actually a very small difference

maybe your source says that 99 is "much higher" than 95, and I just missed it?

No. The difference between 95% and 99-100 % is a very large difference.

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