Originally Posted by
tyrion
It's more complicated engineering, less complicated for daily use.
I agree with njkayake...
It would be far more expensive to design, undoubtedly heavier, less durable, have worse battery life, and be less accurate.
Most current sensors are cheap, less than ten grams, waterproof, can last over a year on one set of batteries, and don't have to worry about rain/mud/dust etc., obstructing the lense or field of view.