You can time Stalker drops/warp ins in a mineral line and be just as effective as hellion drops and since your build lacks marauders stalkers are extremely powerful against it.
The problem is most Protoss tend to go stalker heavy against terran already since it is the only way to fight mass marauders or reapers early game. This makes effective dropping, especially multiple times against good players difficult.
It seems like a well formed strat, but like many popular strats I believe it has an easy counter when properly scouted and anticipated.
I'll reserve final judgement for when I actually see someone use it against me.
I've heard so much about Korean 4 gate and these other strats, but when I see them in game they are terrible or just poorly executed.