This sounds like wanting to change the keyboard because it looks prettier a different way. I type pretty fast so it's going to inconvenience me. It's not wrong to change your own keyboard but if I come over your house it's silly to complain to me that that I don't type as fast on your keyboard.
I also read pretty fast so having to take time to realize that someone is typing faev to mean five actually ruins the flow of conversation for me. I don't like when people write in accents in books either, it makes me get out of the story and have to spend time deciphering how they decided to spell an accent. I'm not reading something for the letters, I'm reading it to comprehend it. Focusing on the letters is going to make the flow of information much slower. I do better if the story tells me that someone is talking in an accent than I do if someone is trying to write in an accent.
This is probably one reason I don't type in text speak (other than dumb acronyms like lol) because when I type
u want 2 go b4 game
you want to go before the game?
It takes me longer to type the first sentence and it takes me longer to read the first sentence!