The Nth large house appliance that doesn't need to be a humanoid is the clothes folding machine that'll go next to the washer dryer. The difficulty of the task makes me doubtful if we'll see that machine, but one can dream!
The problem with your proposed non-humanoid dish washer robot arm is that I want the dishes to go into the cabinets, not just into the dish rack, and while the robot doesn't strictly need to be humanoid, it's better that it's mobile, and while uni-wheels like a segway is certainly an option, having cracked bipedal robots, that just seems like a better design choice.
Well, there are problems with both approaches, with intelligence, cost, and sensing fidelity being major unsolved problems with humanoids. We still don’t know how to make good fingers for example with sensitive skin.
Considering how much the industry has struggled with automation in cars, I just don’t actually think humanoids will work in the home any time soon. A fantasy humanoid that works well would be more useful than a robotic dishwashing appliance, but one of those is something I believe can actually be built in the next decade.
While Full Self Driving and Waymo grabs all the attention, Blue Cruise and Mercedes' one is quietly doing what's asked, giving drivers a way to sit in traffic on the freeway and pay less attention. So I agree that it's been a struggle, but it seems the computers a managing to win that struggle. At the point where we're disagreeing on 3 years vs 10 or 20, and if there are enough rich people to afford a $20k house robot, I don't feel a need to convince you of my opinion, I'm simply excited for the future. I don't know what comes next but I 'm optimistic about it.
The problem with your proposed non-humanoid dish washer robot arm is that I want the dishes to go into the cabinets, not just into the dish rack, and while the robot doesn't strictly need to be humanoid, it's better that it's mobile, and while uni-wheels like a segway is certainly an option, having cracked bipedal robots, that just seems like a better design choice.