So even though Aeroplan would consider YYZ-BOS a short-haul flight, and since Avion seems to have modeled their plan after AP, and even if I'm looking at a YYZ-BOS itinerary that would come in at under $350, with all of that, Avion would still consider that a long-haul flight and would take 30k miles???

What's the logic in taking 30k miles (or, after May 1, 35k miles) even if the flight costs less then $350?

Why base the miles-needed on the geography of the itinerary? What sense does that make? If they're going to set a redemption strategy based on a price cut-off (under $350 vs under $750) then why does the geography factor into it?