Maybe some technical reasons, but more like the mind set of the JS "community" that if you don't have the latest version of a package 30 seconds after it's push

Maybe some technical reasons, but more like the mind set of the JS "community" that if you don't have the latest version of a package 30 seconds after it's pushed you're hopelessly behind. In other "communities" you upgrade dependencies when you have time to evaluate the impact.