Only War tank uses enough TP to need Goad.
Quite wrong. If anything, my TP expenditure on WAR is the least of the three tanks, largely thanks to their GCDs that don't use TP.

The only time I ever use up more TP on WAR than I'm getting is when I spam Overpower, which happened far less for me once I got Steel Cyclone. On the other hand, I regularly run out of TP on the other two tanks. If you're *really* hurting for TP somehow on WAR, you even have Deliverequilibrium to pull some TP out of your butt.

The main problem with Goad is that it does nothing for the Ninja, therefore, why use it?
With that logic, Foe Requiem and Battle Voice have big problems too because they do nothing for the BRD

I do think Requiem is flawed in that it will aggro things that aren't being fought (I would like it to work more like GEO bubbles in FFXI, where it only affects/aggros enemies that are on your hate list), but just because they don't help the user deal more damage doesn't mean they have a flaw.