I agree with what you say about removing the padding from the top bar, and I agree that the toolbars icons should be either the same size as the rest, or upon user override(through user preferences) at either 2, 4, 8, etc. times the size(of the other icons).
I am inclined to disagree with the removal of the blender logo at top left, but perhaps it should be optional.
On the subject of the icon for the currently selected tool I think it should be able to open up when clicked into a list of all the available tools, except unlike the 3D view-ports tool pallet it should be listing horizontally.
And on the topic of the tool pallet it should actually be a pallet that docs to any of the available view-port corners(so perhaps not the top right) and I’d even like to see it optionally floating around should the user choose to move it as such.
This in turn might open up the possibility to add back an action bar similar in nature to the “tool-less toolbar” as it essentially was in 2.79 and previous versions. Optional of course, as should be the tool pallet.