Job action combos one button

[Shurrikhan]

Couldn't this be achieved using a macro?

Doing this via macros sacrifices the ability to queue those skills (requiring button-mashing or, better, hardware macroed or controller-based 'turboing') and much of their hotbars(' space) in order to make room for those macro-based swaps. Such takes a fair bit of time to set up and, again, comes at cost.

Normally, for PC players, such is done via mods. Consoles players stay in their corner and keep quiet, because asking for parity would dumb down the game.

I'm fairly certain that other inputs, via weaving, could break the macro entirely.

I had assumed he was referring specifically to hot-swap macros, but, yes, timed macros will break if you are within an animation lock (the brief internal cooldown shared by all distinct actions, including those that do not incur the GCD) when the timer completes and attempts the next skill in the chain.