Are You Leading, or Just a Really Senior PM?
The key difference is that teaching scales, while doing does not. If your approach to leadership is just an extension of your approach to product management, if you are still in the details and still making sure every major decision is right, you are not actually leading. You are just a really senior PM.
How to Create a Product Vision
Your product vision should articulate the journey you're inviting users to undertake, where they, the heroes of your story, overcome challenges with your product's help. This story anchors everything else.
Even in this world, more things exist without our knowledge than with it and the order in creation which you see is that which you have put there, like a string in a maze, so that you shall not lose your way.