Searched up this topic btw
If I have bind vestige and bind vestige improved as a level 3 wizard, and start gaining anima mage levels, what happens to my binder progression?
The class ability reads: At each anima mage level, your soul binding ability improves as if you had also gained a level in the binder class.
The feat reads: If you become a binder after taking the feat, you lose its benefits.
If I where to interpret this in a rather abusive way I would say you start binding as a real level 1 binder at your first level of anima mage, but you have paid two feats for the benefit.