Old sync world recovery efforts

Not being able to recover old worlds ruins the investment of time, and effort people have continously put into your game, and no amount of skins, or texture packs are going to recover the pain of being forced to say goodbye to the world that was uniquely our own. It doesn't make sense that we can recover and play it on Minecraft preview, but It's not able to be on the main game? #Stopkillinggames

Please get back to me let's fix it like a creeper hole