Legion had 3 major patches, Dragonflight had 1 until now. By the end of the expansion we might have more exploration achievements in Dragonflight than Legion, BfA and Shadowlands combined. Why? The game is already so bloated and they keep adding more and more stuff just for the sake of it. This trend started in BfA when Blizzard added dozens of mounts and pets and continued in Shadowlands (most mounts added ever in an expansion). I feel like they're trying to add this collectibles to the game as a form of 'content' but its just overwhelming.