I think you mean if you are willing to buy it regularly without sampling. We bought a few brands prior to our current buying pattern.
I am not willing to buy milk without sampling. Currently we have two that we like. Basically, one has extra fat added, but the other comes in a reusable (literally return for reuse) glass bottle. If only I could get both.
Even high quality milk is a commodity although a niche commodity.
Think of it this way. There is an art piece that is being produced millions of times and people even buy it multiple times. It's a commodity because it's consistent. It's always the same.
If every art work was different then it wouldn't be a commodity.
The same applies to specific brands. They are a niche commodity. Each pack of milk is identical. The amount of milk you buy is the same in each pack (within tolerances of course). You don't care which cow ended up producing the milk. If each pack of milk was labeled with the cow it came from and each pack had a different quantity of milk it wouldn't be a commodity.
I'm not incredulous, I have no doubt that someone might have specific preferences for milk.
I'm arguing that 'commodity' isn't a bad word, because it means 'consistent' and similar, not 'low quality', as your up thread comment implies.
If you don't investigate every package, you are taking commoditization for granted, there's trust that it will be what it is supposed to be. That's it's done at the level of the individual farm is all the better, they are able to deliver commercial volumes to Whole Foods with consistent (predictable) quality.
I am not willing to buy milk without sampling. Currently we have two that we like. Basically, one has extra fat added, but the other comes in a reusable (literally return for reuse) glass bottle. If only I could get both.