The key difference is that Apple (as an organization) appears to have an overarching roadmap (that spans multiple product lines). The secrecy is irrelevant as long as the leadership of each division is aligned (it hurts, but does not prevent success). Google, MS, and others are less organized at the top, so subdivisions of the overall org are left to plan for themselves and between each other, which leads to conflicts. Resolution may be achieved when things get pushed high enough, but only if it surfaces at the top for a leader (if such people exist in their org structure) to declare a resolution and focus for the groups involved.