While it's interesting to look into chorded keyboards specifically, the take-away for me here was more the general idea that it's not terribly difficult to come

While it's interesting to look into chorded keyboards specifically, the take-away for me here was more the general idea that it's not terribly difficult to come up with interfaces that are objectively more effective than the status quo by a pretty serious margin and still completely fail to achieve large-scale uptake. On the other hand, I believe there's lots of room for improving on the status quo in a way that isn't necessarily intended to ever supplant the conventional alternatives, just focusing on some subset of users who have a good reason to be willing to invest a little more time in becoming more effective. (This is part of the process that led me to design my own custom keyboard.) If you look at Emacs or Vim users, it's clear that some people are willing to spend a lot of time learning skills that improve their efficiency.