> A discussion about building a specific feature can devolve into reevaluating the entire product roadmap if you let it.

Well, if the product roadmap doesn't hold up to scrutiny, it _should_ be reevaluated. Too often people commit to something, and then continue building it, despite the market realities having shifted underneath them. I see most teams not asking themselves often enough "should we still be doing what we're doing", than the opposite. The sunk cost fallacy is real.