Squadron limit break (Ungarmax) can be used in regular duties by any job

[Alistaire]

Yoshida-san has commented on the Ungarmax bug and about the emergency maintenance.

Wow, that line about them investigating whether or not it was reported 4 months ago sounds like if it was, not only are players in trouble, but whoever "from the GM team" it was reported to that sat on it.

...and the whole thing definitely sounds like the official response when the ffxi salvage exploit was discovered.

Again, the line is fuzzy, but I tend to find something like duping is a more obvious "this shouldn't work" than "I used a skill implemented in the game and it works."

The line isn't that fuzzy. What you're saying is true, but not in any way that matters. If you had to make a top 10 list of most obvious exploits, yes, duping would be higher than using a skill outside its clearly-intended area. But this isn't a top 10 list, and there's no reason at all why "only the top x infraction types" should be taken seriously.