[masklinn]

> are named parameters considered the "default" choice in Swift

Most definitely yes. In fact it used to be that the first parameter was implicitly positional (in Swift 2 IIRC), this was removed to make all parameters named by default.

And do note that you can provide a single label for a parameter, it will be used as both "internal" and "external" names:

    func foo(bar: String) {
        print(bar);
    }
    foo(bar: "3")

    func baz(qux quux: String) {
        print(quux);
    }
    baz(qux: "4")

> and is using different external names so common

Also yes, it's absolutely ubiquitous, if only because that's the one way to provide "positional" parameter.