Macro wait times and echo are not in sync.

[CookieMonsta]

I don't understand what you mean by "Macros don't queue skills".

This is very helpful. Thank you very much.

The way skill queue works is before the server has confirmed you have activated a buff i.e. ur game packet has done a round trip from ur PC to the Server and back and you see it as a status effect, you can pre-load the next skill by spamming the button. That way, the command for the next skill, in this case, BfB after IR has been sent to the server before the confirmation that IR has been activated returns.
This is essential for double weaving your skills in between GCDs (or even precasting before initiating GCDs) because you eliminate much of the delay for activating 2 oGCDs back to back. Macros however, don't queue skills so this means it waits for the confirmation from the server before initiating the next skill, not only that, macros enforce a minimum delay between skills which means you effectively waste 1-1.5 seconds of uptime for Internal Release (whereas a queued BfB can activate as soon as 0.2 seconds after IR), finally, macros themselves cannot be queued so if I say pop an OGCD before this macro of yours, I have to wait for the server confirmation that the previous skill has cast before I can cast the macro thus ballooning the time(e.g Kassatsu then your macro means I have to wait 0.5-1 second to even initiate the macro after Kassatsu)