If you have worked on several ultrasonic transducer products, you will easily be able to provide several technical problems that you had to solve. I believe we as engineers don't give enough attention to not letting the problems happen again.

Yes, we know how to fix the problem quickly. But, we don't take active steps to prevent it from inception.

Development is cheap and problem solving is expensive. In fact, problem solving is 10x more expensive than development in my opinion. Spending a significant amount of resources to prevent a problem is still cheaper than having to fix an unplanned problem.

An example is regarding piezoelectric crystal suppliers. Most transducers have only one crystal supplier, and companies are constantly getting burned by issues coming up with their supplier in terms of property variation and even price gouging. Having more than one supplier is inconvenient and difficult to maintain, but it's an important step to take once your device is reaching early stage maturity.