While it's true that my complaint stems from having to use 4 hotbars to do one thing, that's only my personal problem; the way that this issue specifically affects me. As you can see, I've figured out a way to work around it for myself (I'd actually experimented with copying bars from other jobs as well, as you suggested), so while my request would benefit me, the reason I bring it up is more of a matter of principle.

The core of my complaint is that there's no command to put a macro on a hotbar slot, while there are commands to put just about anything else you can imagine on it. I simply find it strange that this functionality is so conspicuously absent given everything else we're able to do. Disregarding the way I would personally use such a feature, I just want to see it in the game because given all the other hotbar commands there are in the game, it feels like adding macros from our macro menu to the hotbar should already be something that the system is capable of.