The list isn't an absolute order of priority. It's just used to help me gauge what I should focus on. It also provides a somewhat centralized task list that the community could contribute to.
In any case, I don't know that a centralized mapshot repository is a super high priority. If a bunch of people vote for it, perhaps I'll change my mind, but I think things like a single player mode, better textures, improved tutorial/first time experience, performance improvements, etc. would all be above this.