Why Core Web Vitals are unforgiving?

Core Web Vitals are unforgiving

You can have a site that scores 100 on PageSpeed, but not pass Core Web Vitals. Using Daring Fireball as
an example, here is how it ranks:

There is always the possibility that even the most Optimized Page on your Site may fail the  Core Web Vitals test if it was not designed specifically for Core Web Vitals. Unless your site is  fully optimized, there is a chance that the Core Web Vitals will not be picked up by the search  engines.

I was totally taken aback by this. This is a good LCP. CLS is perfect. Even so, a quarter-second FID (First
Input Delay) score is enough to cause an otherwise perfect page to fail. Quite impressive.

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