I would too if they were a little transparent in the change. Such as “We got rid of hero XP in the arena because it required additional coding that will be useless after we eventually rework the arena.”
Instead we were told that hero XP was always a bug.
Which is complete 
.
If something gets featured in the patch notes and never gets redacted then they can’t call it a bug. They just simply can’t!
@Kafka said it was a bug in global chat. Cyrup danced around the word.