the “what” is interesting on interfaces or when you generate documentation with some tool like sphinx or javadoc.
the “why” is interesting when you are somewhere inside a class or function and do something in a “strange” way, to work around a quirk in the codebase or something like that, or when you employ optimizations that make the code harder to read or atleast less obvious why somethings are done.
I like the how the Robots look and Millie Bobby Brown was good in everything i saw her in, so i am carefully optimistic that this will be a fun watch.