CTL- it was the end of your post, and DaasYochid’s comment on it, and your defensive response to that one that made me raise my point. You always have great advice to give, the point about the single pipe line is a good one. It would only be problematic if the back-flow was at the temperature of yad soledes bo, though, which I assume could be an issue for the dishwasher, less for the second sink.
Can you explain this potfiller thing more- I never heard of such a thing. It sounds like a nice solution to the lifting problem. I usually fill it on the counter (my faucet pulls out so it can reach) and then slide it over to the stove, so only a little lifting. Is it another faucet behind the stovetop? Is there a draining area underneath it? What happens if you need to fill a pot when there is already something cooking on the stove- how do you get to the handle to turn it on without burning yourself? Any kashrus issues of hot steam from a fleishig pot hitting the faucet, and then using it to fill a milichig pot?