I don't disagree with your post, Cat 1. However, what would your response be to:
"Ground test satis, report further"?
Granted, some issues are cut and dried. However, I believe a discussion with the engineers is often healthy before something goes in the log. As you say, the Captain has the ultimate veto so if you don't want to accept it, by all means don't accept it.
However as a Captain, when it isn't cut and dried, I'm more than happy to listen to the opinion of a licensed engineer before I make my final decision ... and it doesn't mean I automatically agree with him.