I think the most exteme version of overproducing (when you get more experienced) is when you lose the feel/vibe/musicality of the first demos.. or change the track in some drastic, lazy way to fit a more mainstream style for example. (e.g. limiting the hell out of your track without listening properly)

The more time you spend on something, the more you can squeeze the soul out of it, lose the musicality etc. Many, many songs (successful or not) are overproduced, and it's getting ridiculous. I say keep it raw, keep it close to what you initially wanted to do.

Don't get into a pattern of approaching everything the same way, this is a creative art.. not a factory line.