Some time ago there was a post on here about not putting projects out to the world. A lot of devs in the comments shared their stories about projects dying out because they weren't 100% ready. I share the same sentiment.

A lot of it comes from this - wanting to be at 100%. And as some people here have pointed out, the last 10% takes probably just as much time/energy as the first 90. So yeah, it's a tradeoff. There are definitely a lot of areas where the last 10% matters a lot, and is the differential between successful and mediocre companies for example. But, in a lot of cases, 90% is just fine - I'd rather have 90% and live than strive for 100% and have the thing stay in the closet.