You have a perfectly valid point. After a PhD and 10 years of industry experience I interviewed at Google, mostly out of curiosity and because a former colleague recommended me.

I had never done an "algorithms" type interview before, had done no specific preparation, and was a bit baffled by being asked to do a coding exercise in a text editor whilst talking on the phone.

Since I was an "internal recommend" they gave me a second chance. Presumably because they were surprised at how badly I did. But the second interview was worse than the first.

I came away feeling quite humiliated.