Re: I think they need to jusify their claims far better than they have done so far
fn makes the job of parsing much easier. C and C++ are notoriously difficult to parse and the lack of any concrete "markers" for function declarations is a big contributing factor to that. Any language whose goal is to be easy to parse will have a fn or similar marker for function declarations. See Lua and Rust (whose ease of parsing makes for writing declarative and procedural macros a very nice experience)
I don't see the point in complaining over a 2-letter keyword that makes the language itself easier to develop.