I don’t expect that these scripts will be complex enough to warrant knowing about metatables. They will mostly be about filtering data and maybe doing some math

I don’t expect that these scripts will be complex enough to warrant knowing about metatables. They will mostly be about filtering data and maybe doing some math, in which case the infix notation will come in handy. That said, the app will let folks use Racket if they want to. I just don’t want to scare them off with the parens, which many people are unfortunately allergic to, as you say.