Thanks for sharing the idea! :)
One of the most important beneficiaries of the function API are the library authors. They can take advantage of the new composition pattern in so many ways.
Going with a new framework would force them to write two versions of their libraries - the easier to maintain for new framework and much more tricky for the old one.
With the current approach, they can just use the function API to write their libraries and expose them to users of object, function or class API without any issues.
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