Apparently pre-rinsing confuses the dishwasher or something. Not doing it leaves me with residue all over the other dishes though 🤷
It's handled like that in North America, because their mains electricity doesn't output enough juice to operate a water boiler at a reasonable speed:
https://en.wikipedia.org/wiki/Mains_electricity_by_country
So I imagine, in pretty much the rest of the world, it works like you described for Europe...