My usual process is that I'll take a few hours to write a comment, then I'll run out of time and decide to come back later to finish it up, and then I'll never go back to that draft (but I might start from scratch on the same topic). Occasionally I'll finish something in time to post it.
Recently, I have less time than I'm used to, so I've been posting things even if they're rough, in case someone gets value out of it anyway. I guess this makes my posts into scatterings of half-ideas, based on things I've been thinking to myself but only now had a reasonable excuse to mention. (Usually I shoot for a few organized, mostly full ideas, which also have very good excuses to be mentioned. :-p )
Thanks to your suggestion, I'll try harder to talk about things even when there isn't an excuse. ^_^