Those changes are reviewed by maintainers. The fact that a random stranger is able to push a change and get it reviewed, approved, merged, and available in minutes should be the goal of most open source projects. On the contrary, older projects tend to be too reactionary when it comes to infrastructure tools, so in turn they get very slow interactions. This becomes a demotivator for anybody who is used to more efficient workflows.

It is not a coincidence that the author became demotivated after doing some professional experience.