Sell customer support packages, so 1) You can focus on gaining users = giving more users computer user freedom and user empowerment. 2) You can better understand the problems with Emacs' documentation and user interface because people will email you support questions on them, incentivizing you to reduce how many support queries are needed.
User experience testing. a la Don't Make Me Think by Steve Krug.
Path dependence-- sequence points matter.
https://kwokchain.com/2020/06/19/why-figma-wins/