That's interesting. (For what it's worth, when you do comment, I generally find it interesting :))

I often make throwaway responses that may not be worth it. When I have something of substance to say, I often end up rewriting the whole thing for half an hour, as I realise that these things could be summed up thusly, and those things are actually just backscatter from some other larger point. Perhaps a compromise would be to store the half-written comment in a text file, so that at least you can see what it says, and maybe the first half of your brain, if it's insistent it has something to say, could work forwards from whatever it had before rather than spending effort trying to get you to think about it at all...? :)