The literals were just an example. And personally I find it more explicit, which is my original point.
If its faster to run, then fair enough.
Using your example, I think
"My name is {name}, I'm {feet} tall and live in {location}.".format(name="Bob", location="USA", feet=7)
is less explicit than
"My name is Bob, I'm 7 feet tall and live in USA."
and that last one is faster to run ;-)
Your actual example would be:
And with f-strings: f-strings is clearly more readable, concise and actually faster to run.