That means the rider wouldn't know what vehicle is coming and when, which goes against the whole experience.
Also it's unlikely for there to be that many rides queued up at a single residential location which is why they aren't queued up there in the first place.
I think it's about having a pickup/dropoff area, not necessarily a queuing system, especially because ridesharing does not use traditional waiting queues.
Again, specifically not the case here. You are having a different discussion.
"if there's already a taxi rank, then uber should be using that space to pick-up/drop-off. If there isn't, then the current building is already unfriendly to taxis."
Also it's unlikely for there to be that many rides queued up at a single residential location which is why they aren't queued up there in the first place.