Why worthless? I'm not saying it's perfect, but isn't it a better-than-nothing guide? If you've got good eyesight, it's not always intuitive which colors have good contrast. If WCAG says the contrast is bad, it's probably bad (but there are known exceptions where it gets it wrong).
https://www.inclusivecolors.com/ includes the APCA contrast measurement which is meant to be more accurate than WCAG, if you want to experiment with how it compares.
WCAG and APCA mostly agree on what has good vs bad contrast for dark on light color pairs with some exceptions. For light on dark colors though, WCAG isn't accurate and ACPA is much stricter in what's allowed.
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Why worthless? I'm not saying it's perfect, but isn't it a better-than-nothing guide? If you've got good eyesight, it's not always intuitive which colors have good contrast. If WCAG says the contrast is bad, it's probably bad (but there are known exceptions where it gets it wrong).
https://www.inclusivecolors.com/ includes the APCA contrast measurement which is meant to be more accurate than WCAG, if you want to experiment with how it compares.
WCAG and APCA mostly agree on what has good vs bad contrast for dark on light color pairs with some exceptions. For light on dark colors though, WCAG isn't accurate and ACPA is much stricter in what's allowed.