Considering the actual complexity of rendering e.g. Urdu in decent, native-looking way you presumably do want some Turing-complete capabilities at least in some cases, cf "One handwritten Urdu newspaper, The Musalman, is still published daily in Chennai.[232] InPage, a widely used desktop publishing tool for Urdu, has over 20,000 ligatures in its Nastaʿliq computer fonts." (https://en.wikipedia.org/wiki/Urdu#Writing_system)

Edit—the OP uses this exact use case, Urdu typesetting, to justify WASM in Harfbuzz (video around 6:00); seems like Urdu has really become the posterchild for typographic complexity these days

To Unicode? Good god please no. Unicode is just codepoints. I shudder to think what adding scripting support to that would even mean.

Maybe you meant adding it to OpenType?

I was being sarcastic, but yes, I meant unicode...

Sometimes you just can't tell, you know... OK, my sanity is restored, thanks. :)

You mean encoding executable code in plain text files, that execute when you open them? No, that seems unnecessary and very insecure.

Unicode OS when?

That sounds disgusting.