Obviously QM only applies to non-relativistic quantum systems. So I didn't literally mean everything. You know that. You're being dishonest.

In quantum mechanics, the Schrödinger equation is a mathematical equation that describes the changes over time of a physical system in which quantum effects, such as wave–particle duality, are significant. These systems are referred to as quantum (mechanical) systems.

In that case, I can argue classical E&M describes “everything” classical too, so it’s just as bad.

I don't even believe that you don't see the difference. It describes everything with charge. It's about a specific class of entities. Schrodinger applies to square wells etc etc . It's more broad. You know I'm right.