Lather building newb question
I have a question that i can't seem to find an answer to elsewhere. When reading about lather building techniques the usual reference to a mug with soap in the bottom is to just use it to load soap on the brush and build lather directly on the face or in a separate bowl. now my question is why is it not advised to build the lather directly above the soap, will there be an excess of soap loaded onto the brush as well as the lather or is there a harmful effect to the soap itself like over exposing it to water. Thank you in advance and I'm sorry if this question was asked already.