My two mains "why tf is this not built-in" are:

"Why are tuple not Hashable ?!"

Which means that you cannot have a tuple of Int `(1, 1)` as a key in a dict, and you have to make a struct that implement Hashable instead.

And

"Why do they not have a `.sum()` and I have to do `.reduce(0, +)` every time instead."

Or implement it yourself

    extension Sequence where Element: AdditiveArithmetic {
        func sum() -> Element { reduce(.zero, +) }
    }

I think tuples will be (soon-ish) Hashable but cannot as of now because they want to do it right and need something before they can do it.

Why do you feel the stdlib needs a .sum() if using .reduce() is so simple?