That plastic (usually tyvek or zip) also adds a lot of weather protection. That’s why it’s there, to be an additional barrier for the wood should any moisture get under the siding hat will be put over it. I would also guess that if a frame were left bare in the rain they wouldn’t add the side panels until the sun has dried it out. If you added the sides with a big puddle sitting on the foundation, it would be trapped in there.
Latest Answers