One solution that existed for a while was using the `!` operator for deferred. `t!'my defered {str}'`

The main reason for non having deferred evaluation was that it over-complicated the feature quite a bit and introduces a rune. Deferred evaluation also has the potential to dramatically increase complexity for beginners in the language, as it can be confusing to follow if you dont know what is going on. Which means "deferred by default" wasnt going to be accepted.

As for LLM's, it was not the main consideration, as the PEP process here started before LLM's were popular.

Ah interesting, so the complexity wasn't in the API design or implementation, but only in the additional rune? Is that really such a big cost?