I do know that dyslexia basically only exists for phonetic writing.

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0282200

This study claims that German children with dyslexia when being taught Chinese characters performed as well as non-dyslexic German children.

I straight up can't find one about comparative hours learned, but I do remember seeing someone claim Spain spends less time teaching Spanish than the US does English and China Chinese. But also I assume for Spanish any writing before the renaissance is in Latin and most technical writing in English (I remember being really disappointed that the Cybersyn documentation was all in English), English has the challenge of teaching Germanic speaking children a bunch of Greek and Latin loanwords not used in daily life if they want full technicll literacy, and the Chinese education system will teach 8th century poetry to 8 year olds and 13th century poems to actual babies.

In my experience if you ever press anyone who claims logographic writing takes longer for evidence they'll just throw their arms up and go "but there's so many characters" and never produce any actual evidence.

Also now that you mention it, historically phonetic scripts have been limited to the elite in China. Phag-Pa script was basically only used by high level government officials. Manchu was something only the Manchu nobility used. Buddhists transmit their writing primarily in Chinese, with only the elite monks learning Sanskrit (which is highly phonetically regular). Chinese Muslims historically developed their own method of Islamic education that involved learning both Arabic for the Quran and Chinese to read the Chinese classics. Even BoPoMoFo was originally something that was only intended to be used by linguists. If any of these scripts were actually that much easier to use than Chinese, it surely would've spread to the lower classes.

The closest you get are the Dungan, who speak a language that's like 60% Chinese 40% Arabic loanwords, who used the Arabic script. Ironically Western linguists consider Dungan a dialect even though it's pretty much the only clear cut case of a seperate language compared to Chinese dialects they consider to be languages.