Blizzard not updating old cards to Rush does not make sense.

In the past the argument has been made with Recruit by Blizzard that they would not update old cards with the new keyword because Recruit was thematic to the expansion. I never thought this was a good argument at the time but at the very least Recruit was legitimately thematic to a dungeon delving expansion. They cannot make the same argument with the keywords Rush, Echo, and Start of Game as none of those are particularly thematic, yet they still refuse to rename old cards. It just seems particularly lazy on there part and smells of decisions like not updating Rexar where they say they are doing something thematic when really they are just being lazy.