“Blackpill” ratios are not phrenology, they are commonly used in healthcare/medicine

Let’s start with the most important and heavily weighted one:

Eye separation ratio. This is used to make the right glasses. Optometrists produce eyewear based on a “bell curve” of most people’s eye spacing. This is so important that it influences other aspects like if you have a longish-looking face. Then there’s others like how long the chin is compared to the space between mouth and nose. It clues dentists into overbites/underbites.

I’d say the only ratios that don’t hold relevance in healthcare are the nose width or eyebrow tilt, but those aren’t important for looks as much as structural issues.