Sorry, I miss read the post. I agree with you, we are not launching the Db navigator any more with the session connection because as soon as the connection to Database is established, we are launching the Unified Editor and the Unified Editor has got a DB Explorer tree.
The Db explorer has most of the features and functionality of old Db navigator tree. So it is like a new work flow, where you will be having a Db explorer tree attached to a single editor.
We are trying to bring more and more functionality of the old DB navigator to the Db Explorer. Please let us know how you feel about this new work flow.
You can still launch old db navigator by using F12.