You also forgot to take into account that any ability or WS used resets the swing timer.

Maybe if that wasn't the case the quicker delay weapons would have a viable set up, but since its not most of the Garuda weapons are side/down grades from what we currently have.

Obtw Sanction Weapons are pretty beast when you pay for the Sanction buff to be active, and some of them are stronger than Ifrit Weapons when you do.