I do have to say that the repeat offenders, people who quadruple post at times, don't reign it in even when told that it's bad form. Then again, it is stated in the rules that double posting isn't allowed. I think that the occasional double post is fine, especially in the case of a developer who posts an update, then a couple of months later, if the post becomes dormant, they come back and post again. It could be considered the same if someone needs help with some sort of urgent problem, and can't find the answer they need anywhere else. It's a balancing act, in other words. I do think that some people abuse it though, in which case they should be reminded that it's bad etiquette, if nothing else. But really, as I said, some of the people who do it won't stop even when told to, so meh.
Also, it is sort of unnecessary to split what could have been all one post into 5 successive posts, that, I agree is highly irritating and should be dealt with.
The glass is neither half empty nor half full. It's just holding half the amount it can potentially hold.