Earlier quoted context omitted.
"You're out of your depth." That's what you do. A lot of very smart people think because they're very smart they have some kind of exceptional insight into the inner workings of all things. They don't. And they need to be reminded of that. Intelligence allows someone to gain that insight faster than those in the middle of the bell curve of IQ, but it doesn't magically confer it . It still takes time, reading, researc…
A better response would be to tell them you are done trying to convince them because you own the responsibility and consequences of the decision. "You're out of your depth" is an insult and is intended to be one.
To me, your proposal sounds more like a band-aid, instead of treating the core ailment: someone who won't recognize their own fallibility.
Perhaps it can't be "treated", and we just have to make do with such "band aids". But wouldn't it be more productive if we could just get to the root of it?