I would say that you need those separations to divert flow into the individual transfers. But the act of knife edging often does cause turbulence at the split zone which slows down the gases being transfered into the combustion chamber. The other part of the equation is where you want the gases to go into the combustion chamber? Often having different convergent zones will either increase torque or increase high rpm hp but usually will not do both and the design of them should most likely be inline with what you want the motor to do. Street racing, hill climbing blah blah.
-naz