Comment by gerbilly

Exactly this.

It's one thing to knowingly keep use simpler data formats or approaches (callback based concurrency model) to build systems that are small, _and will remain small_.

That's defensible.

But what I see is a bunch of new programmers not bothering to learn established systems, systems that have tackled a much larger problem domain, and deriding them as legacy garbage.

XSLT has its cruft, but lets see the JSON YAML fanbois tackle the same problem domain with their toy formats, then we can compare like with like.