Weber manifold vacuum

[CompClassics]

zrayr or Gaz64

Have either of you seen people that have to run external vacuum reservoirs because of vacuum being inadequate enough that they've had to resort to vacuum reservoirs and or external vacuum pumps to create the vacuum that their vehicle needs?
Why would it be that even manufacturers that offer individual runner EFI systems build vacuum reservoirs into their manifolds, because they can afford to, engineer, design and manufacture something that is not necessary? I've used these systems on several different engines and can attest to simplification of tuning a individual runner system, wether it be a carbureted or EFI fuel system.
You can install a vacuum gauge on one cylinder and while the engine is running it should show a vacuum reading, is this amount of vacuum going to be enough vacuum to sustain what you are trying to accomplish? It's sort of like having a air compressor with a five gallon reservoir and trying to operate a tool that requires a minimum of a ten gallon reservoir, the air compactly is going to be insufficient to operate the tool properly.