The "no true Scotsman" phenomena is similar to the coastline paradox.

It's impossible to find a generic example of any given class.

Because everything in the details is an edge case.

Everything in reality, as you get closer, is fractally complicated.

The closer you look, the more variance and wrinkles you find.

The average of the class never really exists.

When you look at the population everything looks the same; as you get closer the differences dominate.