I am an engineer and it’s just legitimately hard to build any kind of sensor that lasts and stays accurate longer than like 10 years especially without maintenance. They do intentionally design them so that they don’t last longer, but that’s because a design that would last longer would costs like 10x as much and require a lot of maintenance and calibration that your average homeowner is simply not going to do. It’s honestly surprising you can make an accurate smoke detector that even lasts 10 years as cheap as they are.