maikidmag

40 minutes ago, Orton Rd said:

They are for lazy people and waste a lot of water

Sorry, but wrong.

Twice.

3 minutes ago, tomazbodner said:

Not true. Unless you're really good at saving water when washing them by hand.

 

As for lazy people. They are a convenience. When you finish eating you can just put dishes in the box and there's not a mountain of dirty dishes that need to be washed immediately. When it's full you turn it on and it does the job. And given high temperature of water inside a much better job than by hand. But each to their own. If I was a retiree with nothing to do all day, I'd gladly do all by hand just to have something to do. But with lacking time for everything including sleep, anything helps, and if this one dies I'll buy another one the same day.

You're are absolutely right.

But there is no answer to the OP's question:

'Can someone explain - why don't Thais accept these amazing inventions into their households? '

There may be many different reasons, one of the problems might be different size

and form of the dishes. Especially if there is 'family nearby'.