True, but if people do not have the skill to write with some literacy, then no matter how much effort they put in they will not write better. For instance, Your example at first was,
Lagh Ruadh
bob go to tha armary nd look around nd poke swordz i luv swordz he say
If said person who "wrote" this was to put more effort into it, the most he may be able to do is write with proper English, but even then it will still only make up one line and not have any detail. Giving people the ability to learn writing skills will allow them to progress as a writer and add in the things that they couldn't before like... What he was wearing, the actions it took for him to get to the sword, the curiosity in the sword that made him feel like poking it in the first place, and perhaps even the tone of voice he spoke in when making his comment to no one in particular besides himself.