Word_Break for Hieroglyphs

[Michael Everson via Unicode]

On 14 Dec 2017, at 08:09, Richard Wordingham via Unicode <unicode at unicode.org> wrote:
> 
> Is there any valid reason for Egyptian hieroglyphs to have
> Word_Break=ALetter rather than Complex_Context?  So far as I am aware,
> hieroglyphs lack visible word breaks in both inscriptions and in modern
> transcriptions.

Why should visibility matter here?

Michael Everson