Without reading the article I thought that's what they meant.
For me the biggest QoL improvement has been switching to a split ortho keeb (https://github.com/foostan/crkbd). They are super cheap to build (corne is 42 switches which are the most expensive component of a keeb) and once you get the hang of it they are superior to any other typing experience.
Learning how to use a 40% had a steep learning curve, but after a few weeks I was very productive and now I don't even think about the layers.
Since corne is so easy to build it's a great introduction into building your own keyboards. I just recently purchased the components from keyhive and I think I only spent $110 -- if that? That might sound expensive for a keyboard you have to build yourself but the prices for custom built keyboards can get insane (in the thousands)