You can do beekeeping without a QE, but as I said it would have to be treated as a warre hive, where you would have to keep putting the supers under the whole hive (you would need to read up on the whole subject of the warre hive and how it works) gives the queen lots of space to lay, but hard to find QCells. With the QE in and holes in the super the bees don't have to travel the whole hive which in a good year could be 3 or 4 supers. Saves time for the bees and saves wear of the comb from travelling bees inside the hive. I don't make holes in my supers by the way, have read about it and if I had 5+ supers I might do it.
Steven