Not to mention recognizing individual letters. The difference between “a” and “b” in Latin alphabet is drastic. In dotsies you could only tell them apart if other letters near them give you relative height of the dots to some baseline.

Dotsies seem to make a tradeoff where they optimize for higher information density at the cost of much higher error rate (or requirement for precision and accuracy if you will). I also definitely see your point about font sizes. Basically it’s a valiant attempt at a reimagined alphabet but I don’t think it actually achieves higher info density in the real world.