f("Consider...")

greet("Hello {name}")

What was wrong with the standard way to write function application?

Python is sufficiently dynamic that an implementation of greet(...) can look up one level to resolve {name}, right? That's why Python will forever run like a dog. Might as take advantage of it to build such capabilities in user space.

This crap is going to end up inside f-strings inside tag-strings inside f-strings inside... We have a language. Don't extend it to express what it's perfectly capable of expressing already.