Fine with me. The social app is basically an app. It happened to be built into the blockchain, but from a software design or blockchain consensus point of view there really isn't any reason for it. The model of "smart contract" used in Bitshares (predecessor of Steem, predecessor of Hive) was code included in the core blockchain consensus code itself, but the world has moved on and that's not really seen as ideal at this point. The social app should probably be second layer, yes.