No one knows here the term "Form over Function?" How will you vouch for that?
I love Rhino, and perhaps that's the one thing we agree on, or you would be doing something different with your free time.
I welcome change for appearances, that doesn't degrade or compromise usability. To make something smaller or remove functionality for the sake of appearances is a GUI design trap. A GUIs main purpose is to allow the user to interact with the program, controlling it, but also receive information from it. The command line is not only for issuing commands, but for such things as learning the volume, length or area of an object.
[On the Windows side, I can resize the command-line any size I want, and yet it ends up being 1 line for command, and 2 for feedback.]
It is true what I stated that Rhino is much larger than its GUI. By making the command line much smaller, will make plugins and scripts unusable, and that will fragment the Rhino community.
There is one last thing: if the Mac Rhino's power is compromised, when it comes down to it, people will run it under Windows.
(I am pretty objective about this as, I would rather run it under Mint/Cinnamon Linux.)