By far the most important piece of equipment a snowboarder has is his boots. Without good, proper fitting boots, the best board/binding combo in the world will suck ass.
It'd be kind of like putting some used, bald tires on your bike. Great bike, but sure does suck with those shitty tires, right? Except what you're talking about wouldn't be equivalent to used, bald tires. It'd be like putting wheelbarrow tires on your bike. LOL!