You're saying: why buy a dishwasher and a washing machine and a dryer and a vacuum robot etc if you could buy a home robot to do all of those chores by robot-hand?
> Your dishwasher uses dramatically less power and water than you would use, if washing them by hand.
Only if used optimally, or the handwashing is very wasteful. There is one study I know of, it was paid for by washing machine manufacturers and has quite a few issues (like not removing outliers).
And yes, I measured my usage of water and power.
(I’d still get a dishwasher if my kitchen had space for it)