There are a lot of practical reasons that speak for standardised spelling & grammar, but it nevertheless, it restricts people's acceptance to language when used freely to create art.
Although I can't claim to be among its stringent adherents, I agree that standard orthography is important. As you suggest, however, it is not all important. "Misspellings" can be useful in poetry and, probably, in literature in general. Of course, misspellings as such require a standard with which to conflict.
The conflict of conservatism, in the literal sense of 'conservation,' and the maverick is universal. The academy can be stiflingly conservative and, yet, leaving aside the question of anarchy (which I am ill equipped to discuss), the presence of conservationist institutions is necessary to culture--to conservative and maverick alike.
