The main advantage of the 8x T/B setup is that you can run a much bigger cam and still maintain drivability. having individual throttles and trumpets means the reversion pulse from one intake doesn't upset the flow in the adjacent intake ports. The bigger the cam, the more overlap and valve lift the bigger that pulse coming out of each intake tract.
The other advantage is that by varying the length of the intake trumpets you have a degree of manifold tuning to match the cam you have chosen. Much like the importance of primary tube length in a set of headers, the length of each intake tract has an impact on how the motor will perform.
A good example of this intake tuning is the Crower trumpet injection setups they used to run on BB Chev powered CAN-AM cars. They ran staggered length trumpets to flatten out the torque curve.
You've probably seen the iconic intake setup that was often replicated on street machines and hot rods in the 70's and 80's.
Cheers