Its not about planning less!
You introduce the fog of speculation in your plans, and your plans become an anchor that make it challenging to respond to reality as it unfolds.
Keeping your foot on the ground is what you should care about, not predicting all the steps you will take with your foot before you actually have to take those steps.
Begin with humble plans and set clear Product / Sprint Goals.
It’s not about planning less. It’s about planning more when you know more.
What you’re trying to achieve should always be leading, not the initial plan you cooked up when you had the least understanding.