I am an amateur composer.
Page layout is important to me; I like the line breaks to be significant punctuation to the score.
i.e. the end of: sections, parts, phrases, lines of verse/lyrics, are all good places for a line break.
When composing a piece with an anacrusis this is not so straight forward.
I've never seen this done before so I suppose that my questions are:
Is this a good practice; is it breaking any engraving guidelines or rules?
Would musicians reading such a score, prefer this technique; or does it impair readability/functionality?
Are there other professional scores that also follow this practice?