I think Mr. Daniels' comment about the sacred domain for Cherokee, by
which I assume he meant native religion not Christianity, is relevant
here. In general, as the script undergoes domain shift from home to
school or church there can be a shift in the phonemicity(?) of the
script.
The script is altered in most cases, but not in every case, so it is
interesting to examine whether there are patterns across scripts and
whether this shift both in domain and in script characteristics is
influenced mainly by native speaker needs or external influences.
I have been a student of script standardization processes for a long
time but now see how Unicode is a significant plahyer in script
standardization.