Hot take: I fixed a dryer by telling the owner to use it less
Had a customer who kept calling about their dryer overheating. Instead of selling them a new heating element, I asked about their habits. Turns out, they were running huge loads back to back without letting it cool down. I told them to space out loads and clean the lint trap every time. It worked perfectly after that. Maybe we focus too much on parts and not enough on how people use their stuff.