And you accuse others of "splitting hairs". Imagine that.
I'm sorry, but why do you think Gorefriend's Grasp has a 2-minute cooldown and Sigil of Chains has a 1.5 minute cooldown? Because if they had lower cooldown than that, like the 30-second cooldown Skaggit's ability does, they would be overpowered. Especially since Gorefiend's Grasp does less of what your "Grav-o-bomb" does, since all it does is pull mobs and nothing else, but still has a 2-minute cooldown.Also we're back to the worthless argument that an ability with a different/new mechanic is automatically viewed as OP for "reasons".
Let's take a look at other NPC abilities, shall we? In Nazjatar, you have common NPCs who have an ability that increases damage, haste and movement speed of all friendly units within 20 yards by 50% on a 30-second cooldown. Don't you think that ability would be overpowered if it went to a class, unchanged? Or a more simpler ability: 2-second cast, root for 3 seconds and deal physical damage on a 3-second cooldown. Wouldn't that be OP for a player class? Or how about a defensive cooldown that reduces all damage taken by 40% for 30 seconds on a 2-second cooldown? Wouldn't those abilities be overpowered if given to player classes, as-is?
You can look at them all day and it wouldn't make any difference, since those are different games of different genres with different rules and mechanics. So using those games as "proof" of how one ability would "have to damage and pull" or anything is meaningless. Not to mention dishonest. And also, absolutely nothing of what you see in those games cannot be replicated by the other themes. Walking bombs, throwing fire, pulling mobs, etc. All things already done by currently existing player class themes.You can look at the WC3 and HotS Tinker abilities.
And considering no one is making even a single fuss regarding frost mages and frost death knights "cannibalizing each other", or fire mages and destruction warlocks "cannibalizing each other", or mistweaver monks and restoration shamans "cannibalizing each other", or even holy paladins and holy priests"cannibalizing each other", shows that your argument about "cannibalizing" is irrelevant.LoL!
The inability to play all three specs at the same time has absolutely nothing to do with two classes cannibalizing each other ability and design wise.