Washing up bowls are for decadent camping, Defrosting fridges, being sick in and washing things remote from a sink.
Sinks are for washing stuff in and are almost self cleaning. Why do you need to put a smaller bowl shape inside a bigger bowl shape? Bowl users sink’s smell bad which indicates bacteria. The plastic gets all greasy,
you tip it all out and still have to clean the sink anyway. Weirdos.
I fill bowls and plates individually with water camping style and rinse the plates. But mostly use a dishwasher for a whole week in a oner which saves water. Energy consumption must be even stevens..