Sadly in the rush to profit from emergency exit seats it falls on the cabin crew to ensure that people sitting there can operate the seats and I fear they may not be as rigid as they should be (or have the time to be).
Obviously before they could be 'sold' check in staff would allocate the seats after giving punters the one over to check they at least look physically able and are not drunk..
Wouldn't put this on Saga. Also I suspect those doors are bloody heavy, and a lot of people who assume they could open them couldn't....