That is due to how patch management works on consoles. For PC, you just release a patch. For console, you submit a patch for approval. As such, it is typically best to roll a few patches together for console, because it takes time for the approval process, and at one point it also had a monetary cost (fees), but I'm not sure if that is still the case these days. You'd see the exact same thing for D3, if Blizzard was actively updating it.