What would it take for us to get a proper macro system?

[Edewen]

Do macros add delay when it only queues one action, it's only when there are multiple skills one after the other right? I've never really fiddled with them besides making my little UI controller for gear sets and stuff.

Yes.

For example.
If you hit a button for say heavy shot .2 seconds before the gcd is up. It queues the ability to happen AS SOON AS the gcd is up.
If you hit a button for a heavy shot macro, regardless of if it has the offgcds built into the macro, that queing will not happen and you will lose time for each action as the human input can never hit to button exactly when the gcd is up. you will lose tenths of a second every time.