Conversely, English has a joined form(cursive) that is nearly dead because mechanical text assistance devices (first typewriters, now computers) work much better with the block form. While sad in a cultural loss sort of way the joined form only really makes sense when the text is hand written.

I am not familiar with the history of Arabic typography, but I sort of assume there was an archaic block form and their current joined form is the result of many centuries of encoding hand writing practice. advanced enough that falling back to a block form is impossible with the side effect of making simple mechanical text formatting also impossible.

As for Chinese derived characters. we currently are able to jam them awkwardly into our alphabet optimized structures(one code per character) but I wonder if a Chinese native encoding would look different. Would it make sense to try and represent the sub-characters present in each Chinese character in the encoding? I suspect not, Chinese works, but it also does not appear amiable to simple mechanical assistance.

Another wrinkle with Arabic is linguistic conservatism. Due to Islamism and the idea that Arabic is the language of of God (the Quran was written in Arabic by the supposedly illiterate prophet), Arabic has lagged behind other languages in terms of innovation.

Hebrew is a closely related semitic language that simply adopted a block and cursive form. It has also been greatly simplified and friendlier towards loanwords, which has made it far easier to learn.

There's the https://en.wikipedia.org/wiki/Ideographic_Description_Charac... that kind of does that. The problem is that there's character divergence (see all the brouhaha about Unicode Han unification), so there needs to be something else to select variants too.

As a reference, I don't believe any of the pre-Unicode CJK&c encodings attempted that.