I had to respond to this since I didn't believe you were serious at first....so I'll just fill you in on a little history dating back to Wrath of the Lich King Hunters.
Back in Wrath Hunters would Macro Silencing Shot and Kill Command into their spells because they weren't on the global cool down and had little to no resource cost. It was basically free damage for just macro'ing the shot into your other spells.
Then we got Focus, and Kill Command was on the Global....it took about 2 seconds to realize that MM/Survival Hunters will no longer be using this spell in a PVE environment because A) it has a high focus cost and B) it does crap damage for them.
Kill Command has its uses in PVP for the more hunter reliant specs, but thats why there are two tooltips. It would be just a tad bit unfair in PVP if a Survival or MM hunter could bust out a KC from a pet that hits just as hard as say Chimera Shot, AiS or ES....Plus that would make Hunters even more OP in PVP...and we'd be nerfed more in PvE #MoPHunterLife