Name one task, besides creating a loop for increasing magic skills (who cares?), where creating a macro loop with Windower scripting leads to an unfair advantage over another player.
That you are trying to overlook skill-up botting shows that you have a problem distinguishing right from wrong.
Time factors into FFXI achievements. Common to all interactive progress-based MMORPGs (and most RL sports) is the concept of having every player start from a level playing field, where the only variables to affect achievement are the time they spend and the decisions they make on how to use that time, within the boundaries of allowed behavior.
Windower enhances your ability to play FFXI with the same limited amount of time and removes many of these time-efficiency dilemmas. It makes those without windower look worse. They'll average fewer gear swaps (statistically, out of laziness), resulting in diminished damage, cure potency, damage reduction, and you know what. They'll experience more fatal distance mistakes, require extra effort to SC, and be slower to react when beneficial JAs become available.
That's not a level playing field. People have to contravene the ToS and install a 3rd party program. They will have to overcome a moral obstacle of disregarding policy and a social obstacle of ignoring the wishes of the game designers.
I brought up botting only as a way of getting onto the same page as you. But I suppose it wouldn't matter if I gave examples of killing mobs in a lowbie area with /targetnpc /ma Thunder <t> (and low-MP-triggered resting), turning in moss to an NPC for fame/gil, advertising teleports or item sales on a secondary account, and auto-assisting the targeter in a dynamis run with /ta Player /as /a on /ws <t> (bonus points for BlinkMeNot so you never lose the initial /follow Player). It's the fact that you could let these processes run with SpellCast while you afk, whereas a legitimate player would have to be at the keyboard or be unable to repeatedly hit the macros.
And speeding, while statutorily different from reckless driving (so what?), is still morally wrong. The chance of an accident never goes down to zero. Speeding imparts greater kinetic energy to whatever accident occurs; thus, property damage gets amplified, whatever injuries sustained, exacerbated. Of course, with fixed reaction times and limited sideways acceleration, the chance of an accident naturally increases. If speeding were harmless to others, there wouldn't be a social policy basis to maintain laws about it all over the world.
I'm sure the advantage of speeding, however, is obvious to you and deserves none of the elaboration I've given to the potential advantages of using Windower.
Would like to finish this with a well-articulated quote from "DJM" of ffxiclopedia forums:
There's a cause and effect for everything and you can't enhance your game experience using illegal 3rd party applications without ultimately degrading the game experience for others who aren't. And basically by using Windower you're taking a stand and saying "Well, too bad. I just don't care.". Whether this game should have improved UI functionality or not is beyond the point. Coming from many other MMOs I certainly notice the features the UI lacks but it doesn't change the fact that this is the way the game was designed to be played, it's balanced upon that design, and a portion of the playerbase can not get around those limitations whether they want to or not. You either play the game on the same level playing field as those people or you make the decision that your time and dime are more important than theirs and you cheat.
...I would say that the largest negative effect Windower has had on this game is the fact that it created a gray area in the minds of so many players in terms of what is and isn't cheating. When SE clearly states modifying your gameplay is against the rules, what is and isn't cheating should be black and white. But Windower started off by introducing minor modifications, and then a little more, and a little more, until eventually some players couldn't see the difference between using it to run the game in window mode and using another application to walk through friggin' walls. From point A to Z it's an insane leap in logic but not when the road is peppered with one slightly worse "gameplay enhancement" after another. Except for a handful of them, I think I have spent some time nearly every MMO to date, and I have never, ever seen such widespread cheating in a game as there is here in FFXI. And, even worse, such a large acceptance by the community to the point where the people who aren't cheating begin to suspect they make up the minority.
What he mentions in the second paragraph is what I was trying to summarize with the term "slippery slope."