Has anybody experienced accuracy issues on a rifle before with a break on it? I know you might have a POI change but have you ever had or known anybody that had accuracy issues with one?
I have not seen any change in rifle accuracy with and without brakes, and Ive had a bunch.
What I can say is that a brake makes me shoot "better" longer because there is less recoil.
If you have identified your optimum charge weight correctly, you should not see a change in accuracy. All of my rifles shoot just as good with or without a brake.
Quality brakes will not hinder accuracy. There have been some reports of accuracy issues with some cheaper brakes and some suppressor mounts. AAC was one I remember hearing about.
One thing to consider when shooting with a brake for the first time is the concussion or blast back. It can take a bit to get used too, especially if shooing indoors. It can lead to flinching, but can be quickly overcome with repetition.