Originally Posted by
sandwich_bird
Couple of things:
If the Protoss vectors are conic, that means that the force coming from the point is evenly distributed to the base. If you launch only one vector from the middle of the body, it would be hard to stabilize like below (upside-down representation) unless increasing the power increases the area of the base. Of course, you can't really move like that but...
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With only 4 evenly spaced vectors at a 45 degree angle from the ground, it should be quite stable (think of a cross from a top down perspective) and it should allow gracious movement if you master the "art" of balancing the forces propelling you through the power output of each of the 4 vectors (maybe add a few more vectors if you're that good).
Now, when you try to levitate something other than yourself, it is not the conic base that holds the object but the point. Increasing the intensity of a conic vector doesn't help and can even cause issues because of spatial restrictions. In other words, if you increase the area of the base, you can't stack as many cones unless the cones can overlap without interfering with each others(which we'll assume they can't). So to properly levitate something, you have to control many small conic vectors which we'll assume is a very hard thing to do compared to just increasing the power output of a vector (which the Terran can do because of their cubic vectors).
Hope that makes more sense. Kinda hard to explain without images XD
EDIT: Thinking back on this, changing the area of the base needs to have something other than a direct linear relation with the power output.. We can just say that psionic users have 3 abilities:
-controlling the base area size
-controlling the power output amount
-controlling the number of vectors
And even though a psionic user has both control of the base area and power output, increasing the power output still has an exponential effect on the base area size(so increasing the power a bit doesn't really change the base area size but, at a certain point, you start to really affect the area size).