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It's also a problem when adopting new functionality in existing frameworks (eg. upgrading an app to new Android release), dropping the use of deprecated functionality, taking advantage of more readable syntax in programming languages, etc.

> taking advantage of more readable syntax in programming languages

"AI" is the programming language here. The readability of any lower level language(s) that may exist as a compiler target of the "AI" is about as important as how readable assembly language is to someone writing software in Rust.

If they don’t, then will the bleeding edge technologies ever be used by more serious apps? Will it even be ready if we don’t test it with easier use-cases?

Probably not, but I guess the worry would be, if nobody adopts and uses them, bleeding edge technologies don't become the new normal. Unless you think we've reached perfection, it's almost guaranteed that future developers will look at React/Python/etc as we look at developing in Assembly or COBOL.