Have you ever seen the movie A Few Good Men? In the courtroom scene at the end, they discuss the rules in the Marine handbook. There are official rules ( the important stuff); and then there are the unwritten rules...like how to find the mess hall, code reds, etc.
If the C of C chooses to not have instrumental music, I am 100% fine with that. If a church chooses to sacrifice animals, I am 100% fine with that. To me, those type issues are just little details similar to finding the mess hall and code reds.
Where I have a problem with the C of C is that they judge the others to be wrong. I am not saying all C of C do that. However, I attended for 20 plus years and most in my church judged the others to be wrong.
And the music is just one example; there are many. My C of C believed that you had to be dunked to be bapitized. Sprinkling was no good. Yes, I know the story about going down into the river. But if it was so important that it would keep you out of heaven, would they not have made that really clear in the New Testament? Once again, I am fine with the C of C dunking. But don't judge the others.
In general, the Calvinites got zoomed in on a bunch of little details that don't amount to a hill of beans. There is an old saying that reads, "Avoid having your ego so close to your position that, when your position fails, your ego goes with it." That is where the C of C stands today. They have believed that old garbage for so long that now that the position has failed, they are floundering.