This needs more than an IF statement. This needs calculation of the rate of change of the variable, in addition to observing the value of the variable. Rate of change calculations are atleast an order of magnitude harder than just reading the variable. Doing it for infinite number of variables, in embedded, memory constrained, real-time systems is hard. So this wasn't going to be fixed via trivial 10 characters of code. But, yes, a more complex system would have avoided it.