Except your "backyard shed" is actually an uncountable number of your cells that are "edited" (changed using the reprogramming abilities inherent to mRNA, but god forbid you refer to it as such) into not being "backyard sheds" anymore, but being factories for spike proteins that can't be stopped other than waiting for the fire to burn out. After a few weeks, you don't get your "backyard shed" back, because the craftsman destroyed it.