That’s where you should use something more like top / bottom /s
I think in this sense, master is more akin to the ‘recording’ master - The best version of the recording to which others are generated, and all parts merged; no ‘slaves’ necessarily just the ‘master’.
And it’s opposite (Schrödinger’s Box?) - The (edge) problem that you can see and is guaranteed to exist and cause problems but somehow never does and the code works perfectly.