4.1 didn't contribute much either apart from fixing a very specific bug.4.1 for me, since 4.2 and 4.3 were just pathetic attempts to curb piracy, and contribute nothing.
I find it ridiculous how an unofficial group of hackers knew the programming of the Wii better than Nintendo themselves. It took them 3 tries to kill Twilight Hack and another 2 tries to kill Bannerbomb. They didn't bother killing Letterbomb when they probably could have easier than Bannerbomb.
Having said that fixing the game exploits would have been very tedious as it would have involved releasing patched versions of the games.