So, the challenge here is that these don't help be a better "programmer". However, they do stretch the mind which helps.

Unlike others, I love whiteboard code challenges. However, they really are a proxy to IQ which does correlate to job success. This works for big tech as they need more fundamentals especially if you hope to have any success climbing towards principal engineer.

Sadly, most jobs don't really need it and the reason is prices law. Applying the actual science in a real way is done by a handful of engineers in an org.