We do the same too if the pod is 1 day to 1.5 days old. If the pod is more than 1.5 days old, I figure that the insulin has been at skin temperature for a long time, and may get compromised if we use it for too much longer.
But, to tell the truth, I do it for safety (not using it if it is more than 36 hours old), but I don’t really think it is necessary. If I was short of insulin I’d scavenge.