Evidence that Macros Do NOT Cause GCD Delay or Lost Casts

[Iscah]

And as I've demonstrated, the above is untrue: macroing GCD's does not add up to lost casts over time.

You've only proved something that isn't the actual point of the warnings against macros. Why would people be making a macro to do nothing but a single GCD spell? Unless you really want your Fire/Fira/Firaga spell naming back or something, in which case I salute your dedication.

The concern with macros has always been that people think they could use macros to set up an entire sequence of attacks with a single button press, with "wait 2.5 seconds" commands in between them – which all actually turn to 3 seconds, thus the warnings that it will cause you to drift.