Your first point suggests these questions have some value for you in identifying people's skills. Fair enough.

Your second argument admits that this is basically a hazing ritual. Of course you will have to learn some things you don't intrinsically care about in the course of your work. The difference is, that isn't part of a process that we intentionally designed to be that way. Admitting that your hiring process requires useless knowledge that people just have to learn to get through the process means you admit your process doesn't measure what matters and is just a hazing ritual. You're putting up hoops just to see who will jump through them.