It's a big question of "am I comfortable updating" when you see a major version increase. If a project is doing a major version update every month, in my mind that's probably not a well designed project, the developers really didn't think their API through, and it's a huge risk to my business trying to integrate that into my product. Every month I'm going to have potentially breaking changes that will suck down developer time.

For projects like Rails, where they optimize for developer productivity, it's good that we've only had 5 versions in 13 years. It's a stable platform to base a business from. When I see projects like React where they've released 16 major versions in 5 years, as a small developer that is a huge risk to take. There should not be that many breaking changes if the project was well thought out from the start, and I can't spend that much time fixing everything that breaks every few months. And if the project was so poorly conceived that it needs 16 major versions in 5 years, there's probably a lot of broken stuff in version 15 that I need to update to version 16 to fix, so I can't just stick with the older version.

On the other hand, I feel Python waited way too long between 2.0 and 3.0 and introduced too many changes all at once, leading to the headache of so many people still using 2.x more than 10 years after the release of 3.0.