With caution, here are a thoughts on this thread and controversy. Stepping back, one question to be asked is: "is this a little problem or a big problem?" It seems the differing conclusions come from very different perspectives.
Initially, it wasn't clear this was a big problem - some have shot happily with this back and not found the problems. All backs offer promise but have limitations. Heck, even other high end products (pick your poison) often follow the line of more refinement or specialized, the more temperamental or limited they can be. Was this one of those? Some years ago, I had a Credo 60 back that showed some banding on some sky shots, A note of concern was sent to Steve H., who calmed me down, and said, yes, in some situations it can happen. So first thoughts were perhaps this was the same and not so critical an issue.
However, this back is promoted as usable on tech cameras AND with the stunning combination of low price, high resolution and BSI sensor, offers the trifecta, a holy grail solution for tech camera users(assuming the crop sensor). Hooray, so many problems and issues solved at once. Many were excited.
This issue shows all the signs of crestfallen hopes, and consequently, anger at the manufacturer. Did they know, why didn't they fix, how could they offer it? But the reality is that these things do happen, not everything is perfect out the gate, and also our tolerance for these situations has clearly diminished.
Personally I have moved my read of this issue from it was a "little" problem to "its sort of big one". It is possible to shoot without incurring the difficulties, and some have found ways to work around it, but it's also quite possible to shoot and have it raise its unattractive head. And as someone said, once seen, you see it. Is it trivial? No, not for this crowd, most of whom are pretty dilligent and use gear to the fullest. Is it end of the product? Not likely. Probably (my guess, no insights) this will get fixed.
The point is that different folks see this differently. The facts were murky in the beginning, it seemed more "within the tolerance of acceptable", but it's now seen more broadly and clearly. Let's all hope Hassy addresses this, and puts this problem behind them, and work together to that end.