Yes, I did. Hence why I pointed out one of the characteristics that made it work fine in the scenario mentioned (that it has a relatively small set of users tha

Yes, I did. Hence why I pointed out one of the characteristics that made it work fine in the scenario mentioned (that it has a relatively small set of users that can be trained), and many of the concerns I mentioned are not particularly applicable to the situation which the OP presented. I was making the point that the OP's success is not necessarily transferable to large scale applications.