There was a very very long discussion on this point alone, and there are a lot of weird edge cases, and led to weird syntax things. The high level idea was to defer lazy eval to a later PEP if its still needed enough.

There are a lot of existing workarounds in the discussions if you are interested enough in using it, such as using lambdas and t-strings together.

Would be useful in that exact case, but would be an absolute nightmare to debug, on par with using global variables as function inputs

I do think that people are far too hesitant to bind member functions sometimes:

  statement_endpoint: Final = "/api/v2/accounts/{iban}/statement".format

(it's likely that typecheckers suck at this like they suck at everything else though)