I would not quit the game if auto-attack was introduced "copy-paste" from FFXI.

But if it was to be introduced, I would prefer it be somewhat more refined. Perhaps with more options, like the other posters described.

Or broaden the concept. Why does it have to be an "auto-attack"?? What if it was an "auto-action" that you could configure? Attacks are just one type of action in FFXIV. What if your Conjurer could configure their auto-action to be Cure? Every time the cooldown was ready, a Cure would fly off to whichever PC they were targeting. Naturally, if the Conjurer started initiating a different action, that would take precedence, over the auto-action, just like using a weaponskill would stop a warrior's auto-attack temporarily.

Just a thought.