The 'Chinese' Theory: For and Against

[RadioFM]

The drift could be explained by a scribe changing or refining his invented script over time, it happens often that people forget scripts they invented themselves, or that they come up with improvements or detect shortcomings to the script.

Still, not only is it strange that someone or multiple people would choose to create a new script instead of using a standard alphabet, but that it would coincidentally reuse share glyphs seen in other cipher manuscripts, many of them used in typical abbreviations to be fair, sure † , and placing them in their usual position (y at wordbreaks). Shouldn't we expect to see more marginalia in some European language if there were no motivation to conceal the information to some extent? Some small footnote like chol = cho4 or some glossa for ambiguous words like 'shi'? I would argue that some desire to conceal information must exist at the very least (not that it excludes the possibility of a non-european language underlying an invented script)

Edit:
† A set of glyphs standing for whole syllables (like y = us) would be a good starting point for writing languages like these I guess, but why keep a reduced inventory of glyphs and why not use them more freely within vords?