There is isn't there?
The size and complexity of an aeroplane increases the number of people it can potentially kill in a go. Given that, you would expect the powers that be to expect more aspects of the aeroplane to be checked as part of the airworthiness approval process, and in more detail.
That surely is as it should be. Any questions are over proportion - does the complexity of the certification process increase at the right rate, too much, not enough? Or, conversely, if we start at part 25 aeroplanes and go down, does the complexity of the certification process simplify enough as we go down to lighter weight aeroplanes ? Or too much?
G