@GhostOnTheHalfShell first off he’s not bringing anything. he has no real power at bluesky. the actual CEO has said so herself.
but atproto does bring benefits over activitypub, like the ability to define many types of apps and their relevant entities (posts, etc) without polluting each other’s namespaces, total account portability (including post history) even if your original host is no longer available, etc. it actually is a better protocol.