>The flighty attraction to the new shiny is somewhat driven by a lack of understanding of how either the new or the old shiny actually work. If you understand the job you're setting out to do you're in a much better position to decide upon tools, frameworks, what to do in house, etc. If you don't you're stuck gluing black boxes together, because any actual code you write will be far worse.

Writing my own sort routine? Pointless but pretty harmless.

Writing my own docx parser? Sure, that will be one mythical man century of work.

Sometimes we are using black boxes because we have created so much accidental complexity that we can't do better than "this works, we don't know why and we dare not change it". The browsers js must target are some of the biggest black boxes even though they are open(ish) source.