There's more than one reason why Stone and Anchor saisons aren't the greatest. However, the "delivery mechanism" is ONE of the reasons and here's why:
When you force carb a beer (and package it in cans OR bottles), you can only achieve about 2.7 volumes of CO2. The classic, old school Dupont/Blaugies type of saison has about 4 volumes of CO2 and that's a big part of what gives its character. This can only be achieved with bottle conditioning. Force carbed saisons are under carbed saisons. The can vs bottle issue is kind of a red herring -- the bottle conditioning's the thing.
This is also why dupont and blaugies on draft kinda sucks -- draft systems can't pour at 4 volumes of CO2, so they undercarb the draft versions and everything about the beer feels wrong. This style of beer is designed to be delivered through a high carb, bottle conditioned bottle.