Knowing something is not about memorizing the equations. It’s not about being able to apply formulas. You haven’t learned a subject until I can erase the equations from your memories and you recreate them from scratch.
Equations are tools to succinctly encapsulate understanding. If you only know the equations, then you’re just memorizing passwords. You don’t know the subject until you can create the equations. You don’t actually understand a phenomenon until it’s intuitive.
There’s a big difference between a proof and a why. Simplifience is here to teach you the latter. If you want the former, pick up a textbook.