There are two reasons why you would ever want to use something more complex: determining when the triggering happened (ie. who to blame) and ascertaining after

There are two reasons why you would ever want to use something more complex: determining when the triggering happened (ie. who to blame) and ascertaining after the fact whether the trigger event was really meaningful for the package contents. You can build such an electronic sensor and it even can be cheap if reusable, but it mostly is not cost-effective. On the other hand trying to build such an thing is good source of interesting stories, like sales reps of three different semiconductor manufacturers calling you at 4AM and wanting to know what the hell you are designing and whether it in fact is not missile guidance system or some other ITAR covered thing...