My comment on there is about a surge in popularity of these over a decade ago, with a link to a previous comment about problems I remember them having that prevented them from being usable for most people ( https://news.ycombinator.com/item?id=47956979 ), because of their intended design rather than an implementation issue. For example bullet 3 was a problem in one, that another tried to solve with bullet 2.
I don't have time right now to look at this one to guess if these apply, but might be interesting/useful for someone else.