I posted this in papercuts but think it is more fitting here. I should also mention that the add shapes option is pending with the developers, though they seem to be adding it to the toolbar which I think could be the smarter move because the icons are relative to where you use them. Maya also has a very cluttered set of redundant tools, that can waste time learning and search through (some times up to five tools for a task Blender can solve with one). So I am hoping Blender can continue in keeping their UI in as smart and clean of a layout as possible. For example, the shapes could start as the three simple primary shapes, (Cube, sphere, and pyramid), and those three icons could be long clicked on for drop down for there 2D or other variants. Personally, I think the smartest way to handle this has objects UI replace the transform UI when nothing is selected because it gives a starting place for the transform.
I also think it would be more intuitive and fluent for the render button to be in the Viewport because taking a photo in real life is simple as clicking a button when looking at something you like. In Blender, there are a lot of confusing tricks that come into play, dealing with angling camera without knowing the hotkeys, learning about the outliners and modifier camera visibility options, useful options like lock to view are hidden in one area when settings and the render buttons are in another, not to mention for some reason it brings up a new cluttering pop window instead of just switching the themed tabs. Most of the camera’s features really don’t become useful until you introduce animation, so I think it is something worth simplifying and streamlining. Whenever I am in the viewport I press the camera button half expecting for it to take a viewport rendering like in 2.79, I’m not sure how to do that anymore but instead, it goes to camera view, it would be crazy in real life to be looking through a camera with the button and yet its no where to be seen. Fortunately, the gizmo and perspective UI disappear, making room lock to view (the same way people in real life can look around through a camera lense), and a snapshot button, along with a drop down for the more advanced rendering options.