Regarding the Project Browser, there is a post here:
Cubase and Nuendo dropping Project Browser - Nuendo - Steinberg Forums
I currently use it in N12 to edit automation AND tempo nodes, in addition to Key Signature changes whereby the MIDI channel field is unavailable for editing, e.g., via the List Editor.
What I believe users need, now that the Project Browser has disappeared, is to have Automation Nodes available, in a similar way to how Tempo Nodes are currently shown in the Inspector, albeit with full editing capability, i.e., in the case of Tempo, to be able to change Step vs Ramp, which is again unavailable, in addition to being able to reset Bezier nodes for Automation; notwithstanding a complete dataset being made visible. for both data types but without horizontal scrolling being necessary.