Not like I'm an expert on differential geometry, but I've studied it some privately and as an undergraduate.
While studying for this, it dawned on me suddenly, like the storm clouds that pile higher and higher until the first bolt of lightning strikes the ground, that vectors and 1-forms are different.
Every thing I have ever read in physics equates them. Or not really. Everything I have ever read in physics doesn't even demonstrate that it understands why those two should occupy different semantic domains.
What the heck am I even talking about?