Good CS fundamentals are important
Yes they are. Except, these interviews aren't testing for that. Finding the maximum sum subarray isn't testing for any fundamental.
Just because someone wrote an impressive framework or library doesn't mean given a complex problem outside of their known domain
Why are you even hiring them for something that's not their expertise? Seriously, that's literally the whole point of the interview. I don't think Max Howell was trying to get in to the DeepMind team.
Calling these just some other web framework or package management tools is doing them an incredible disservice. Twitter used Rails. Airbnb uses Rails. If Airbnb hired DHH, it would be Airbnb's fault if they made him tune hyperparameters of some ML model rather than see how their web performance could be improved.
Honestly, at this point I'm convinced I could get HN to talk poorly about John Carmack's programming skills.