People keep repeating this argument that you don't need to know how to do X (where X is something extremely easy) because that's not part of your job, doing your job entails Y (much harder). That's BS. I have never met someone who was good at their job but couldn't do easy things. That's just cope. If you can do hard stuff, you can do easy stuff. If you can't do easy stuff, you definitely can't do hard stuff.

You are not going to do well on "computer bugs" if you don't even have the basic intuition of what an even number is.

Yes, stress is real, that's why we ask very easy questions during interviews. Like summing even numbers.