Also a key point. If they are currently working on it, we can assume that there are some problems to be solved and the system is still not perfect, as some people state.
I've certainly never seen a statement to that effect or even close. The point still is that if the files (ultimate source) are never the same, there is no point in continuing, and that is pretty much what TAS articles (I can't really call them a study) seem to state.