I am not sure why you all feel you need to do this.
The user interface is not broken and I have heard NO complaints the way it is or was.
When you add things leave the old the default STOP changing workflows.
The Ribbon still stinks and is STUPID and now you are changing user interface for commands, STOP.
For new users this is not a big deal but those of us that have been using Inventor from day one it reduces our productivity.
NOT IMPROVEMENTS, so just stop