Preseed question

I'm not even sure if this is the right group to post this question but if you're ttc and your cervical mucus is already on point (meaning it's egg whitewhen  it's supposed to be and sticky, thick, watery and creamy when it's supposed to be) is there a need for Preseed? 
I read it mimics your natural cervical mucus or what your cervical mucus should look like during your fertile window. 
So i guess my question is, is Preseed mostly for women who hardly ever or never really see their egg white cm? Or does Preseed do something else special that I'm missing?