I did say the example was extreme DFS - the air is certainly a bit thin in KTM. Perhaps that's why the 'grass' always seems stronger up there and it remains a popular place with aged sky-pilots? And yes, even with QNH the big lumpy bits do stop the wreckage reaching the runway - there's tons of aluminium confetti scattered on the far side.
Nevertheless, my example does illustrate why QFE isn't suitable as a standard; and even for students going round and round the field in circuits, there are hidden dangers - as WITCH just pointed out.
Old Smokey says it all - "A pox on QFE!"