I would rather see syntax to make partial application on arbitrary named or positional slots as ergonomic as possible. How much has that been explored by existing languages?
What I've seen: (A) anonymous functions with placeholders (see above), (B) currying (ML), (C) binding variations defined with the function itself (Scala, I think?).
One approach that I haven't seen yet (maybe some language has it?) is named bindings for arbitrary partial application. I _think_ that would be a little tighter than anonymous functions, but I'd need to see it in action.
