The issue that I have with Direct Hit is that, for tanks, its a dead-end stat; barring the release of Grade 7 materia, the maximum amount of DH we can get now will be the same as what we will be able to get in patch 4.5. Fending gear does not get DH on it, and our number of available melding slots aren't going to change, which means we can already obtain the maximum possible amount of DH that tanks can get.

On the other hand, Tenacity values are only going to increase as the expansion progresses, and I would imagine that damage outside of tank-busters is going to be much higher in future content, making greater passive mitigation a more appealing choice.