i think that there should be a spell check so if yoy wrote something wrong and you didnt notice you can just press spell check instead of posting a typo or going back to change stuff
IMO even spell checking isn't that big of a deal. I don't know, its just not that important. If you're someone like me with like 60GWAM its not needed that much.
If you really do need spell check though, i suppose it would be alright if there was something like right-clicking on the misspelled word and there would be a small list of words that the cpu would have for you and you can go from there.
If, by some miracle, that I DO misspell, then i just type it up in Word, then it would have a list of words for me to choose, as said by my suggestion.