I don’t think that most people would inherently expect all food to last forever, or even for extended periods of time.
Surely everyone is acquainted with canned food if they were alive in the last 200 years.
After having both canned and uncanned, fresh chicken, you would never expect the former to taste as good as the latter. Diminished flavor during canning is a compromise we deal with to keep these foods for long, extended periods of time far past their natural expiration cycles. Even refrigerated chicken isn’t going to last very long by comparison. But this principle isn’t exclusive to food products. Cannabis might be a flower or weed, but the condition of that flower is going to deteriorate after the plant has been harvested. Since it’s a moist plant medium, cannabis flower products are susceptible to more mold problems during processing compared to cannabis edibles or cannabis candy products more specifically. If you don’t clean your packaging equipment, any spores from one batch of cannabis could get into another batch. By the time you’ve been using the jar for a week or longer you begin to notice that distinctive “musty” odor that accompanies mold and mildew. Honestly this can happen just from the spores that are naturally floating in the air outside and inside buildings and other indoor spaces. That’s why I don’t try to purchase half a dozen different jars of cannabis flower products and expect them to list six months or longer. Instead, I try to use most of my cannabis within the month in which it’s purchased. Even if the weed never develops a bad odor, the terpenes are breaking down as time goes on, making the cannabis inherently weaker.