And the remaining 50%: making it easy for people to give you useful feedback, such as error messages giving a web link to a user-friendly bug tracker. Ideally the link already fills in the stacktrace and system info.
The main goal of the systems I work on is to provide technical documentation of complex industrial processes. If things break, it can be pricey and/or dangerous. Having good information is a must.
However, if a user sees that something is off or just plain missing in the sometimes 30+ year old documentation, the easiest way to deal with it is to make a note of it and adapt to it for his or her work. Reporting the problem back in order to get it fixed is....difficult. There probably is a process for it, you probably don't have an account where you can log the time spent on it.
Having a quick and low-threshold way to report problems would be of enormous value in the long run.