Everyone has an opinion, and every opinion is equally easy (equivalently, equally hard) to demonstrate by an appeal to a private revelation. You're right, there

Everyone has an opinion, and every opinion is equally easy (equivalently, equally hard) to demonstrate by an appeal to a private revelation. You're right, there's not even any point talking about it unless you have some way to back it up that beats "try it and see." Everyone can say that about arbitrarily different claims.