Yes, I see. I’m already using Result on all my methods so it should be straight forward to add.
As for your last sentence, I agree, but it just feels like every single project building on canisters will want a way to protect their methods, no? So I’m a bit surprised that there’s no “built-in” way to do this already.
In case someone else is interested, I dug up this topic which appears to be doing exactly this in Motoko.