A real product strategy (as opposed to wishful thinking) has three ingredients:
A strategy missing ingredient 2 (transparency) collapses into "wishful thinking": a stated belief about what will work with no real analysis of how or why it will happen. This is one of the most common failure modes teams present as a "strategy."
See written-narrative-strategy-artifact for the concrete document format (Amazon's six-pager) used to force all three ingredients into the open.
"a lot of product strategies are just wishful thinking. They're just wishful thinking. There is no real analysis about how and why that's going to happen."