With 4 strokes, there are people who treat the O2 sensor as an expendable item and change it when they change their plugs.As I said, How Long before the O2 Sensor would really go Bad on a 2 Stroke, 50hrs, 100hrs, 300hrs, 500hrs? At $20 for a New O2 Sensor if you shop around, I don't see it as a problem.
Challenges/considerations as I see them:
1) Does this actually eliminate/significantly reduce the chances of failure? Many people report that the expected sensor life is quite variable and unpredictable.
2) The O2 sensor is a thing, and things fail. With some OEM EFI software, it is not easy to know what happens to engine performance when the sensor fails (fails high, fails low, fails null, and when it produces intermittent/erratic inputs).
3) Replacing the O2 sensor is "another thing.” Perhaps my experience is unique, or maybe these sensors and their mounts are made of Inconel or other expensive and durable material, but everything I attach to an exhaust system eventually becomes unitary with all other parts of the exhaust system, and attempts to remove them result in a crumbly, expensive mess and/or a trip to the ER for sutures.
In an airplane, the O2 sensor provides little value compared to a well designed open-loop EFI system (or a manual closed-loop using EGT). An O2 sensor (or two) adds considerable costs/hassle. Why have it/them?