DPS and healer 'timers' and rotations are very different beasts, I'm surprised you seem to think that they are so similar?
Healers are not bound to rotations and combinations in anything like the same way DPS jobs are. If I need to throw a GCD Cure II during my PoM opener window, it's a minor DPS loss and nothing else (It costs me a GCD and very little else). If a PLD needs a throw a Clemency part way through a combo or leading into their Req/Holy Spirit phase, it's a far more significant DPS hit as it not only costs them GCDs, but potentially enmity, dot uptime or outright costs them a nukes worth of MP. DPS have it worse still, drop a combo or buff at a bad time due to a mistake, distraction or even just a failed positional and it can have a very significant impact on the raids DPS. If I delay a card for 10 seconds because I'm dealing with mechanics, it's no big deal. If a Nin delays Trick Attack for 10 seconds? That's massive.
Saying it's all just a script is well and good, actually executing it like such is a whole different matter and you know it.