Huh. I have that attitude too -- maybe it is something that comes from being in fandom when LJ/DW was the more dynamic/spur of the moment type of fannish communication and an archive was static and much more trouble to upload to. I mean, I still write like that -- bits of wips posted to my jnl, but once it goes up on AO3 it's ready for the world to see and therefore needs to be finished (at least, to my point of view).