From the article: "paleographers today identify the extinction of scriptio continua as a critical factor in augmenting the widespread absorption of knowledge in the pre-Modern Era. By saving the reader the taxing process of interpreting pauses and breaks, the inclusion of spaces enables the brain to comprehend written text more rapidly."

My favorite deprecated writing convention is boustrophedon: https://en.m.wikipedia.org/wiki/Boustrophedon

Japanese also doesn't have casing or spaces, which can make text written solely in hiragana (like some Famicom games) hard to read. I don't know enough about Chinese and Korean to opine on how difficult they are to read and comprehend, but by using the four writing systems (hiragana, katakana, kanji, and western script), Japanese is easy enough to read.

I've read that it such text usually was read out loud. Not sure if doing so actually make it easier to parse, but maybe latin was more phonetically regular than english?

whenwordseparationbecamethestandardsystemitwasseenasasimplificationofromanculturebecauseitunderminedthemetricandrhythmicfluencygeneratedthroughscriptiocontinua