Honestly; I love the points you bring up...
"Why is there not a unity application within Steemit?"
The Desire to maintain the Steem blockchain does unite us like the belief in a single omnipotent being unites believers.
But the application known as "Steemit.com" is simply a portal into viewing the Steem blockchain, like "Unity" is the portal(GUI) to Ubuntu-Linux.
Currently the majority owners of Steem are also the owners of the Steemit, I too would love to see Steemit build new methods for perceiving the Steem blockchain.
Maybe we could build something that taps the Steem blockchain on the MaidSafe Network or maybe even Ethereum?