I wouldn't call Justin Langer a tail ender and he was renowned for getting beanedOr perhaps is it because the quickies are more likely to bowl short stuff to tail enders - because they aren't so vulnerable now, as they have helmets. And possibly because they aren't quite as hopeless as in the "old days" with everyone being required to do a bit. So many variables in the game have changed since the days of uncovered pitches, no helmets and jumpers for goalposts (oops, wrong sport) that if batsmen are being hit more, it's unlikely to have one single cause.