For me, it completely messed up my whole-word and multi-word reading by shape. Like, I don't read by syllable because I'm not pronouncing the words, I'm just reading the meaning of the whole word directly from the shape of the whole word (or several words), if that makes sense?

Like, when I'm reading, my inner monologue is only "saying" a handful of key words in each sentence, as it fluidity skips over "mentally pronouncing" all the filler/context words.

This completely breaks that. It splits each word into two chunks, neither of which is the word, so I need to show down to "mentally say" both chunks of each word to read them. Like, it's still fast, I guess, but I'd estimate it slows me down by ⅓-½ish and disrupts my reading comprehension significantly.

I assume that if I read like that for a few hours, I'd likely get used to it, but why bother?

On the other hand, I think that could be a great reading tool, I imagine especially for people with dyslexia, but probably most fluent but slow readers.