Originally Posted by
Kojiyama
The other problem is that capping out on rage is still a loss. So, basically, without being a fight where intake peaks are predictable (e.g. massive AoE phases or something) you kinda just want to use the new Inner Rage almost on cooldown provided if you are above 40-50 Rage or so as a tank then simply opt not to use Heroic Strike if you don't get enough rage.
Letting yourself ever cap out is a loss of potential damage, so the 1.5s cooldown simply allows you the option of dumping. If you wait until you hit 100, you have probably lost a lot of the potential Rage you could have had to dump into Heroic Strikes.