In the open source world, bug fixes often come much more quickly. If fixes don't appear, we at least have the source and can try to fix it -- though sometimes that's a high bar.
If there is an obvious need for a tool or library, someone implements it and throws it up on GitHub. Sometimes the implementation is great, sometimes it is little more than a starting point for our own solutions. But at least we have the source to act as a starting point.
Quality is important, and open source often encourages good quality, but as the writer points out it does not always do so. Sometimes it acts more like a neural net AI algorithm that keeps failing and failing until one day it succeeds.
What open source does encourage is a rapid iteration as developers all over the world look for solutions to known problems. It's a messy solution, but it works surprisingly well. It also helps spread knowledge of how what the nuts and bolts of good software looks like.