That's a bummer man, I would hate to delete a character and have to start everything all over again. Hopefully they do address this. As with the lock feature make it a habit to just lock everything you're interested in. Even if it's some crappy high level blue. Lock it. If it's in your inventory it should be locked. Had happen to me many times where I've deleted a legendary because I wasn't really paying attention and it was beside a blue. Just make locking a habit. Lock everything and you should be in a good position to never ever make topic like this again.