I think there is a distinct branch to this path. When you start building your own mechanical, ergonomic keyboards. I know this because I have built my first one couple of weeks ago [1], and am already thinking of how I can improve it.
Same here. I built a Dactyl Manuform, and it was definitely worth the hassle. I do agree with the OP that the stuff you see on the MK subreddit and similar sites is ridiculous, and mostly rip-offs.
[1] https://kubami.com/articles/split-keyboard-build/