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Thrustvector
Air fuel metering is actually harder- the benefit is that you are moving the throttle much closer to the inlet valve, so as soon as you open the butterfly the engine sees the air, as it were.
That's also the vacuum issue though- with a single throttle body at the entrance to the plenum the entire plenum is under vacuum, with the individual throttles at (essentially) the exits of the plenum the vacuum is now between head and ITB, the plenum is atmospheric-ish.