The plastic strap around the oven is used during the initial construction of your oven.
We like to leave them on just incase the form should crack during construction - the plastic strap will hold the form together.
Now, we’ve never had a form break so they haven’t been used in that respect.
At the same time, I’ve never had to use my reserve shoot when skydiving - but I’m not going to cut if off for no good reason.
Leave the straps on - don’t cut them off… just in case.
It’s like your reserve shoot - incase of malfunction.