It's not complicated at all, I didn't mean to give that impression... you just want to be sure that the vacuum signal has enough volume to open at least one of the valves with as little delay as possible. It's like launching a pee from a single straw versus trying to blow 4 the same distance from 4 straws in your mouth at the same time.... all four probably won't make it past your feet and you're going to have to blow a lot harder.... so, to avoid that trouble you either want one of the valves to open with a much lighter vacuum signal or you'll want to supply each with it's own line from the intake plenum. Not a very big deal.
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