Are all those pics just for example? They're all GD series. If you remove the AFM you remove one more point of failure, remove the need to tune for reversion, improve throttle response, off idle and transitions.
I said before Rossco, I'm not bagging PFC's, their just old.

An Air Flow Meter is a complicated electronic circuit, if its even a little bit off, or coated with oil, it affects the way the engine runs.
A MAP sensor is simple, and manifold vacuum is just that, vacuum.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i