No it isn't. That's why hieroglyphics became indecipherable for nearly 2000 years, while all the various alphabetic systems invented during that time--and many of those invented long before--remained readable.

Ugaritic certainly didn't remain readable and it was alphabetic. The only reason alphabetic systems remained readable is because they remained in use.

uhhh I can pick out a person shaped icon from a column of icons faster than the word person from a column of words