I'm not sure I understand how a growler flushed with co2 is much of a benefit to one filled with a tap&tube. Surely once it's filled there would be little to no oxygen in a growler, especially with co2 from the beer pushing most of the oxygen out. Until it's opened of course, which means that a co2 flushed growler would also be back to square 1 once a glass has been poured?
Fill stations are still great, I just always thought the co2 flush was more of a gimmick with minimal benefit for those who plan to open it sooner than later.
Unless there's another better reason for it I'm not aware of?