I think they're talking about data locality. If a single processing step access data that are "neighbours", in some systems that data is likely served from a si

I think they're talking about data locality. If a single processing step access data that are "neighbours", in some systems that data is likely served from a single server. This means a) better performance and b) higher likelihood of consistency. Of course the guarantee is still merely eventual consistency, but data locality does reduce the chance this becomes visible.