The problem is you don't understand what the problem this thread talks about is. A problem which is completly unrelated to the camera filters that you can turn on/off in the camera app.
I'm sorry, but what you talk about has nothing to do with the one this thread mentions. Do you really believe that after 105 replies no one ever noticed that the problem could be easily solved just by disabling the camera effects?
Your "solution" is just for people which turned on by mistake a filter and doesn't know how to turn it off, but does nothing at all to disable the underlying noise effect filter which makes everything look like a watercolor (with or without turning on the camera effects).
The noise reduction algorithm about we are complaining is ALWAYS turned on, and is present in EVERY camera app (not only the Apple one), since it's done at driver level, so whenever an application access to the camera it always receives an excessive noise reduced image.
I'm not criticising you, it's just replies like yours contributes to make people / Apple think there's no problem with the iPhone 6 camera except for the users don't know how to configure the camera app, and that's not the case.
I thank you for your contribution trying to help, but I'm sorry, your solution is not correct, and has nothing to do with the noise filtering algorithm in the iPhone 6 camera.
p.d. sorry my bad english