I don’t think this really caught on because not everyone takes care of their batteries to the same degree. Frequently charging to 100% or draining to 0% has some negative impacts reducing range and performance. You’re likely to receive one of these used batteries in your car with a swap.
Imagine doing an engine swap on an ICE vehicle with a used one that never had an oil change.
Ive had horrible battery life in my 14 pro since 16.6.1. Just installed 17 yesterday and it still seems at least as bad.