You got me thinking too, about oxidation, the important part that oxidates are the trichomes and the cannabinoids inside them. Turning them amber and degrading thca into CBN. So maybe some industrial packaging must use something cheap like nitrogen, like potato chips, in those sealed bads that look like candy bags.
In my experience as a producer (I sell my crop and it's my household only income) the reason to use vacuum sealed bags it's not about the vacuum. I actually never actually create a vacuum inside the bags. I only remove enough air so the buds don't shake around. The important part is the seal. It's the only way to actually seal the smell in. I've had police dogs sniff around cars with half a pound hidden on fenders and they don't smell it. That's why it's used for moving product.
I think I wouldnt use a vacuum jar either just because I think some of the terpenes and probably a lot of molecules would evaporate due to the lack of pressure. Just like water boils in a vacuum, extracting all the smell and moisture out of the bud. But I have never tried it and it's only my prediction