Sounds like this company is small. The processes the author discards have their place. His article more or less sounds like “our customers want a small hole dug, we don’t need to a whole excavator for that - just shovels”.

The reason larger companies write prds, figma mocks, etc is to get alignment across more people that are detached from your individual thing

At a small company you don’t need that. Everyone is working on one main work stream

At larger companies, there’s hundreds or thousands of important projects at one time and lots of supporting teams for those. Everyone has their own shit to worry about and can’t possibly remember all the context on your projects, so you make it clear as possible to quickly bring disassociated people up to speed on why it’s important and what you need from them

It also helps disassociated leadership buy into your ideas. A picture is worth a thousand words.