That's actually a good point. BUT, the carburetor base plate essentially does the same. It is not divided one side separate from the other, EVEN if you use the matching base plate gasket that has the divider like the intake. Because of the vacuum passages in the baseplate, just like a Holley, the two sides are really tied together, regardless. Obviously not as MUCH as they are now with his adapter, but they are. Look at any Holley, Carter/Edelbrock, TQ base plate. You will see the two sides are not separated vacuum wise at all.
