These ideas aren't born in the actual product design teams, where "don't put touch control near things that get hot" or "no unprotected touch controls on surfaces where spilling can occur" are not concepts that need to be explained. The way this usually happens is that product management hands down the requirement from down top, either on their own or after contracting some expensive industrial design agency (i.e. a mixed team of engineering and art majors who never had to sell, service and
especially provide tech support for, any of the products whose outside they designed) to help "refresh" their product line.
Then, when in a shocking twist of events it's absolutely miserable, the tests are slightly mangled to highlight the usability gains ("easier to wipe", "looks modern and integrates well in a modern kitchen") and ensure no one's yearly bonus is endangered.
Surprisingly, it works out really well despite competition because everyone's doing it pretty similarly.
If your next question is "but why on Earth is it done like that!?", well, there are many reasons for that. But the tl;dr is that making kitchen appliances with universal, "boring" features, which last for 20 years, would spell disaster for a lot of companies in a lot of industries, from home appliances to furniture, and for smaller, specialized suppliers in these fields. The market has fine-tuned itself for frequently replaceable junk that's just good enough to that someone can plausibly say "well ackshually" when I refer to it as junk. Anything better would inherently result in much longer growth cycles, which Western management and stakeholders are not capable of handling anymore, and would disrupt "fashionable" trends, which would further prolong growth cycles in both home appliances and connected industries (furniture, home decor, cooking vessels believe it or not, and so on). It would also make it difficult to outsource mass production to cheap factories with poor quality control processes, thus driving prices up even more than the better materials and design would warrant, but that's more of a second-order effect than a cause by now.
Sauce: I used to work on consumer products years ago -- not kitchen appliances specifically but I know people who did those, too. Attending meetings was a lesson in cognitive dissonance and doublespeak and it's one of the least rewarding tech jobs you can imagine.