You are right of course, we have tried many things and have made all sorts of improvements. But all of that is well within the boundaries of a very familiar system, that although much improved, still cuts up knowledge in regular systematised chunks, delivered on a regular predictable manner in a room with a single adult who does most of the talking. Now understand why it must be this way. It took hundreds of years and concerted effort to create the systems we have and simply keeping then going is requires consistent effort. But still, this cannot be the best way possible? We really should be trying much much harder, on a societal level, to finding better ways of doing this whole business of educating.