Is learning C really a must for a programmer?

Many have this opinion. Somehow, by doing manual memory management allocation and garbage mangement one would become a better programmer.

I have little experience in C mainly because I can write terser and more readable code in Racket or Haskell. However I'm willing to give C a try just to learn these lessons that everybody keeps talking.

But I have a sneaking suspicion that I already know most of what is there to know. Can you list some useful lessons that a typical high level code dweller would be oblivious of?

>>13

And how is that supposed to help your case? It perfectly illustrates your fallacy. Slavic languages might have better
theoretical grounding but in practice their value compared to English is insignificantly small because nobody uses them for anything significant.

Nobody said that C had the best theoretical grounding but rather that it is supported everywhere.

This is programming we are talking about here. If you can't be pragmatic about things you don't belong here.