There’s a difference between a few mistakes here and there, and something almost unreadable. Certainly we can all read those posts that are in text language, but that’s not the point.
If I wrote a post totally in pig latin, I’m sure everyone in the CR would be able to read it. However, it would take them a bit longer because it would be more difficult. I care enough about the people I write for that I don’t want them to have to struggle to read what I write. I would just appreciate the same consideration from others.
All the rest is commentary.
I definitely hear what you are saying, but the point is, who is to say that something is unreadable? How much of it has to be in txtspk? How many grammatical errors make it fail inspection? It would really be nonsensical to try and implement any such system.