What the article didn't address is the touchy subject of, do you have to buy?
We've certainly been to wineries where people - especially tour groups - have arrived, tasted most of the range and left empty handed. No doubt that's why some wineries have signs stating that tour groups require prior arrangements. After all, it's hard to stack a couple of dozen bottles under the seat on a mini-bus!
On our recent trip, we put these principles into practice. We visited All Saints (Wahgunyah) with its lovely grounds and interesting glimpse into the winery and Morris Wines (Rutherglen) with the galvanised iron character of a previous era and a couple of wines that we liked.