They are still valid, why?
Because, unless you only do code golf and throw away all the code you write, you'll be writing something that someone (including the future you) will be reading and trying to maintain, fix and what not so it's important that the code is readable.
One might say, your code should be self-documenting so no documentation is needed, I'll argue that it would depend on several things but we're not discussing about documenting code vs not doing it.
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