You can do this, but should you?

Solutions like this, more abstraction to avoid repetitive code, are usually much worse than the problem.

> Though we notice we only greet for mornings and afternoons so always having to pass “Good morning” or “Good afternoon” becomes a bit annoying.

Maybe? But one can do much much much worse than "a bit annoying"

> It would be great if we could create an instance of our “greet” function with the first argument pinned down.

No.