You are aproaching this from the mindset of the code author, but consider a new contributor to a project reading for the first time, with positional destructuring

foreach(var (f, l) in enumerationOfPersons) { ... }

tells him absolutely nothing about what's going or even that there are names involved

foreach(var (firstName, lastName) in enumerationOfPersons) { ... }

is better but doesn't give him an object to inspect to see where they come from and what else is available.