* It's bigger than Braille. The size of Braille is already a problem, because it makes books, signs, and everything else bigger. That makes them prohibitively expensive for most people. It doesn't matter if something is theoretically faster to read, if they cannot afford anything TO read.
* It's a relief system rather than a dot system. Relief systems are consistently harder to read, because you have to move your fingers around to parse them, rather than just rubbing across the line.
* The level of similarity is wrong. There are too many letters too much alike, and it's not like Braille where the variations are all within a consistent grid.
* There seems to be no logic in which letters are circles or squares. If I were doing it, I would've chosen a set shape for vowels and consonants, or voiced and unvoiced, or something like that.
* The effort to mimic standard letters is erratic. A is not bad, but B is iffy and I bears no resemblance at all. The Moon system fares better in this regard, although it has some bizarre choices. It was still outcompeted by Braille.
Here is a comparison of multiple writing systems for the blind, with their pros and cons. It's not that Braille is convenient. It's that this is the least-worst system people have tried.