90% automated is sometimes 90% as good as fully automated. It's not always the case, there are cases where hitting that 100% enables you to do things that were just not possible at all before, but sometimes it is. Recognizing those cases where a 90% solution is a 90% improvement at a 10% cost is a valuable skill.
Yes it's also part of the reason I prefer coding for myself. I can ignore a lot of "what ifs" and edge cases because I'm always there to pick up the mess if something happens. I get to focus on the stuff that makes an impact and forget the idiot-proofing :)
Or said another way, it can be fun and also effective to "Do Things That Don't Scale" [http://paulgraham.com/ds.html].
