Why is it all about succinctness? Swift has never been about succinctness - it’s always been about clarity, without over-verbosity. Sometimes, it just takes a decent number of characters to describe something. That’s not necessarily a flaw, especially if it makes something easier to read.

Seeing .copy() makes it much clearer to understand that what I’m receiving is a copy of something.

If you want a Button template, either extend Button with a method taking the parameters you want, or write a curried free function or something. callAsFunction adds absolutely nothing to the language, bar confusion at the call site.