People who believe the world is great as it is don't spend any effort making the world better.
Only people who believe that the world should be better, AND that it is possible to make it better expend effort to make it better.
I agree, but saying the world is much better than in the past while it still has all the same basic problems (wars, hunger, preventable diseases, poverty, exploitation, etc) sounds to me just like privileged people patting themselves in the back. In the meantime, children die under bombs and starving.
If you imagine too hard, you'll get push back in the form of, "every time we've tried something different, it's been a disaster." Beyond not having an imagination, there are those out there that seek to actively quell imagination. It's literally beyond their reality.