I had an interview with Amazon. The 30 minute C coding test was to take a 4x4 matrix of integers and rotate them left 90 degrees. I started out with a brute force solution - the goal was to demonstrate I know C (I have 43+ years of C and over 1 million lines of C to my name).
The guy wanted an elegant solution in 15 minutes. I don't do well on timed tests. I just could not see the elegant method. I had a chat with my son (who works at Amazon). When I told him about the test, turns out it's an IEEE test - and you are given 1.5 hours to solve it.
Plus, I have seen job postings that are looking for 10 years experience in s 5 year old technology.
I agree with*everything* the author wrote.