I guess it doesn't serve a purpose.

Considering that these are developer tools, *anomaly-variants could be considered "milder" forms of the *anopia-variants, and further come in various degrees.

Further, people with the *anomaly variants can have severe headaches with certain color-schemes, and the best thing to avoid any misunderstandings, is to check for "safe-for-anopia", or/or use a scheme that avoids these altogether, which will also serve everyone on the *anomaly-spectrum.

But that's just my speculation.