The Spamming Troll wrote...
pull and warp is the obvious choice for biotics. why doesnt a vanguard have pull and warp, wouldnt a warrior have warp? but the sentinel doesnt have pull because the vanguard has pull. that just doesnt make sense to me. each class already is a one trick pony, errrrrr cookie cutter....
i give up.
I think you're conflating several things together here. Yes, the Vanguard is a one-trick-pony - that isn't a result of the fact they don't have Warp, as such. It's a result of the poor synergy in the Vanguard's power set, with Pull not working terribly well with Cryo, Shockwave just not working at all and a general style of play that is essentially the same trick, played over and over again. You wouldn't fix this just by plastering any old biotic power in there. You fix this by establishing a solid modus operandi for the Vanguard and then giving them a set of skills to allow that style of play to be achieved.
The basic idea is that the Adept is the master biotic, hence it's not surprising they have a set of skills that synergise - this is the class who have so much biotic ability they operate on a level beyond the other two by using their advanced combos rather than just spamming the same power. Adding this ability to Vanguards and Sentinels would effectively be like adding Charge to an Adept - it would essentially render one class totally pointless.
That's not to say some biotic combos should not be allowed on the hybrid biotics - I still think the Throw/Pull combo would have been a far better idea than the poorly-matched Shockwave/Pull/Cryo selection on the Vanguard while the Sentinel could have made far better use of Shockwave, given it's relatively poor CC.
As for Warp 'because Vanguard is a warrior'... this is neither here nor there. All classes, biotic or not, in this game are 'warriors'.