Counter Question: Did it not matter that Ardbert was an Azem shard?
There were things only Ardbert could do as a reflection of the WoL, and him being one made the relationship he had with us more meaningful. It's like meeting a long lost brother or sister.
Of course people would be excited to see more of them; how is that even something to get confused or irritated by? Especially now that Azem's key is a major focus in the story, the fate and legacy of Azem is more relevant than ever.