Publishers will tend to have a ‘house style’, and so require the use of a particular font, if for no other reason than consistency across their works. Same with text fonts.
As long as the font doesn’t get in the way of reading the notes…
do we know if there is any objective reasons behind their house style choices?
“This is the way we’ve always done it, and it ain’t broke, so we don’t want to change it.”
I don’t speak as an insider here, so maybe someone more experienced can weigh in. But I know that the older and more established the choral publisher in the US, the more entrenched they are in their system (almost always Finale, and often using Maestro).
Yes. There isn’t. 
You might be able to say “this font is softer”; “this font is heavier”; but whether that’s what you want for a particular thing is entirely up to you.
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I just come to release my latest handwritten font, a little sister to The Copyist font family: Rhapsody
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