Cos you bloomin should be wasting all that clean water.
This method uses no more water than filling a bowl, and then refilling it again a couple of times after it’s dirty from dishes. Unless you never empty and refill your washing up bowl, in which case the last few items you’re “washing” are in water so dirty you may as well not bother.
You can try all the reasons you like, but compared to either dishwasher or under a running tap, it’s a useless way to “clean” anything.
when the washing up gets chucked in.
If you put all the washing up straight into the bowl, you’ve just made the water dirty, so nothing is being cleaned properly and you’re cracking the sink and crockery.
Lets not get started on separate taps for hot and cold…