Electric kettles with plastic parts that touch boiling water, particularly the removable mesh thing. It's like a microplastic infuser that's good for about 300 liters, after which it falls apart. Then the kettle doesn't know when to stop automatically and you can't buy a replacement mesh piece because they discontinued that model of kettle last year.
I now have a kettle that doesn't have the funny mesh, but if you don't open the lid while pouring, the scalding hot water just runs down the side.
The old fridge had condenser coils out in the open and you'd just dust them. The new fridge has them under the unit and I can see quite a bit of dust accumulating on them. But I've no clue how to clean them without tipping the entire fridge over.
Also, the newfangled rice cookers. The nonstick coating in them chips off much easier than in regular pots and pans. Then there's 3 or so gaskets, one of which is impossible to remove without breaking the lid. I really hate cleaning rubber gaskets, especially if there's a perfectly fine way to design something without them.