Since this is a question of philosophy, I'll give a philisophical
response. I think you (Micheal Edwards) are asking the wrong question.
You compare Lilypond with Finale and Sibelius so I think you are looking
for a visual music composition tool. Such a tool seems to be a
requirement for meeting your definition of "compatible with creativity".
Lilypond is a tool for producing beautifully "typeset" music; it is
not and does not pretend to be a visual composition tool but it makes
a wonderful backend for such a tool once the user is satisfied with
what she or he has composed.
I think the question you want to ask is
"is there a visual music composition tool that is compatible
with Lilypond?"
and the answer is "yes". At least two, RoseGarden and NoteEdit, have
been mentioned on list in the last few weeks.
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