This brings up a question. Why would aging beer be better in a glass bottle than in a stainless steel keg? Has anyone done side-by-side blind taste tests? I bet someone has!
I dunno, but I just listened to an interview with a Belgian brewer (De Ranke, if my memory isn't failing me) who said they can tell the difference even between bottle conditioning upright vs. bottling conditioning horizontally.... Surface area vs. volume or something like that. 🤷♂️
They must have a hyper-sense of taste!
I (and my friends) can readily tell the difference between beer on draft vs beer in bottles. With the keg beer always winning the flavor test.
We had the same experience recently. I had saved one bottle of a Helles last year that was entered in a competition. We had some on draft in my bar also. In a side-by-side comparison, the keg beer was much better. Not even close. That bottled example actually won a medal, which shocked me.
Beer conditioned in a keg should be as good as beer conditioned in a bottle. Maybe even better, as no light can affect the beer. Is not cask conditioned ale wildly popular?