It definitely matters when you start actually caring about electrons leaping through space over long distances. Like... You'll get the wrong answer if you thin

It definitely matters when you start actually caring about electrons leaping through space over long distances. Like... You'll get the wrong answer if you think the electrons in a CRT go from the screen to the gun, or if it's positively-charged particles that are causing carbon deposition inside a vacuum tube. But that actually turns out to be (for most people) a specialized context. I'm startled to discover (because I was in the same camp as you) that the math is so symmetrical that it really almost never matters how the physical charge-carriers are moving, since it's the change in electric field that is causing things to happen.