It was officially explained in this thread
Again, explained in the thread above
Lie In Wait was creating severe performance issues
Whizbang got banned because it allowed to play Lie In Wait
The ban thread is new, looks like they don’t know if it’s better to have it in the known issues or in a separate topic, but regardless, the ban thread was linked in the known issues alongside the banned cards
Support sucks, that’s true
The only thing they do well is exchange packs you bought from the wrong expansion at launch
By a failure to read a forum. One pinned post with known issues in the bug report forum, one pinned post with ban list in the community forum. A lot of people don’t bother searching for existing information before they report an issue.