That's true, but unrelated to the common usage of the word "expressiveness" when talking about programming languages. There's often a tradeoff between expressiv

That's true, but unrelated to the common usage of the word "expressiveness" when talking about programming languages. There's often a tradeoff between expressiveness and the thing you're talking about, which I'll call clarity. For example, macros increase expressiveness but decrease clarity. In Racket (or other lisps), you can define a macro `(my-let x 17 (+ x 1)) -> 18`. This is expressive, as most other languages don't let you define binding constructs so easily, but also bad for clarity because `my-let` doesn't look different than a regular function, so it's hard to tell at a glance that it's doing something a function could never do.