Interesting. I stopped using homebrew kegs and use sankes instead. Id say my delicate beers last at least an extra month (if they arent consumed) due to the packaging.
There has been some experiments on packaging, O2-intrusion, etc. lately and I agree it's interesting. I feel like the low-O2 process I have been using with spunded beers is about as good of a process as I've used to ensure that the beer sees as little O2 as possible. On brewday the fermenter is closed up and the beer stays in the fermenter, the tubing or the keg the entire time and then it naturally carbonates. I suppose a leaky keg could hurt you in that case but that's where the lube comes in.