Instinct is not always right, especially when it comes to an instrument as complex as the human voice.
no, it's not. as I said.
and when it isn't, I try something else.
But I'm 98% of the time fine with my first choice, AND I'm not even a little averse to EQ to close that last 5% gap between good 'choices'.
I'd rather, in fact, tweak a tiny bit at the desk than interrupt the flow of recording to change mics.
I have made a LOT of records where the vast majority of things were recorded on the same single mic (or at most choice between two, a ribbon and a condenser), and through the same channel (pre, eq, compressor, etc) as well.
I frankly don't believe these records would have in any way been "better" (leaving aside 'more successful') had I picked between mics for each overdub based on 'shootouts'.
I'm equally, FWIW, unconvinced that Nick Of Time would have sounded 'worse' or sold ONE fewer record had Bonnie sung into a U47.