Everyone needs to have made a web framework. Everyone needs to have made a programming language. Everyone needs to have made a supervisor. Everyone has to have made a container manager. Everyone needs to have made a text editor.

Absolutely. I recently wrote my first compiler to get it off the bucket list… brainf*ck compiler/interpreter #100010134 or such? :-) Well… it was a fun half hour.

What's the value of making a supervisor? It seems to be mostly about gluing together some system APIs.

In some industries it’s critical. Think about aerospace where code is almost always homegrown or done by specialized company, and are specific implementations for specific needs. You don’t have that many COTS due to the criticality etc.

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