Lack of proper caps, grammar, and punctuation, IMHO, evinces laziness, makes things harder to read, and is simply incorrect English.
And to some (albeit more sensitive) people, a lack of the above illustrates a profound disrespect for your community's members. I personally don't feel disrespected, but I can understand the sentiment, nonetheless.
(And, yes, on your phone it's not that difficult to use caps either.)