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So the problem is not me "refusing to focus on US sanctions", it's you taking them as an exclusive reason for poor life in Cuba.
You're trying to imply that if US removes sanctions against Cuba, the country will suddenly grow decent economy and people will enjoy freedoms.
But... this actually happened! US has softened sanctions on Cuba on numerous occasions (last 2016) and nothing really changed, except for Castro family being able to travel more and buy more US cars.