Most of the info lost is already publicly available (if one is willing to visit libraries in each electoral ward), so could be collated. Despite that, the manual process of the polls means that it is very difficult to corrupt, and even more so to corrupt without being detected.
In a completely electronic system, it would be so much easier to cheat, and get away with it. It would also be difficult to convince folks that the systems are robust.
In that sense Estonia is 'brave'.