Yeah I suppose pre-clearance is somewhat counter-intuitive, in that you clear US customs while in Canada. The swing gates do suck, but IMO the situation you described (which happens daily, depending on gate configurations) is entirely a fault of WS and not of the airport - and I've been the biggest critic of the 70-73 nightmare since it opened.
WS knows how many people have onward US connections and are repeatedly doing a terrible job of explaining to people that they have to pre-clear.
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