Side rant: you may be someone who just needs to get an Exmor camera for whatever you're doing with astro. I don't know. 99% of people who complain about this are complaining because they don't have bragging rights and that's all. Too much pixel peeping and not enough viewing/printing real photos.
Dude, the whole reason people started looking into banding and DR and figuring out what was going on was because they noticed things when out shooting, they didn't start out in the lab.
It's the little fanboys who can't handle it when anything they spend money on is not declared 100% the best in every single possible regard. The so-called DRoners actually can handle the truth when not every last aspect of the camera they bought doesn't end up being the best.
And the DR guys made such a huge deal because they know it takes time to fix that so you need to complain way ahead of your breaking point and you need to complain loudly if there is a prayer to get Canon to feel like bothering to spend money to fix things up.