This is true and I have a personal policy regarding a post. If I have to read something more than twice to understand what is written, I simply move on the the next topic/post. If the writer doesn't believe his/her post is worthy of at least enough punctuation and grammar to make it comprehensive then I figure they are really not all that concerned if anyone understands the point(s) they are trying to make.The level of competency for writing here on UM is all over the board
Leeway can be allowed for spelling. We all make spelling mistakes. Grammar and punctuation need not be perfect, few of us are experts at that. Reading a sentence or paragraph should not be a chore. If confusing, it can lead to misinterpretation/misunderstanding.
I'd estimate that I have no problem reading and understanding 95% of the posts made on UM. The 5% that give me problems are merely ignored and I move on the something else.