I remember watching postcards or some travel show doing a thing at Coopers brewery. Dr Tim Cooper showed the "proper way of rolling a CPA", indicating to me that they advocate the whole rolling ideal.
When my mates and I started homebrewing a couple of years ago, we made sure we rolled all our bottles of homebrew and dissolved every little last bit of yeast. Of course we've since realised that yeast is not that tasty, especially in ciders
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I think theres a few reasons why people started "rolling" CPA/CSA:
-It's unique to Australian beer, it starts conversation, attracts attention to Coopers, etc.
-I think it makes the beer taste more attractive to swill drinkers. I find with the yeast mixed in, it seems to give a bit of that tart yeasty tang you find in many mega-swill Aussie lagers.
-It stops people from feeling they are ripped off when they have to leave 2cm of beer at the bottom of the bottle.
I don't roll any Coopers anymore (when serving myself), however when serving customers I ask. If they have no idea what I'm talking about and I don't have time to explain, I make an appearance-based judgement call whether to roll it or not; bogans get the yeast, more refined or interstate/international visitors get it decanted into a glass.