Along the same thought...
In every CAD package I have used, left click is reserved for operations (usually selecting). Designating the left click to rotate the part feels very odd. I keep trying to window - select objects, and keep rotating the view. In OnShape (and some other CAD programs), if you Window - Select from the top left corner, you only select objects that are completely contained in the window. If you Window - Select from the bottom right corner, anything that crosses or is contained within the window is selected.
Holding down the middle mouse button will rotate the model. A Shift - Middle Mouse Button Pans the view (some CAD programs use CTRL + MMB). And Right clicking shows a menu of common commands (SimScale provides selection commands).
I'm just suggesting that if you clean up the interface with a view cube, you should also be consistent with mouse operations.
I also agree that all viewing tools should be consistent throughout all interfaces. Right now, even the icons are different.
Well designed software allows the users to focus on the task, and not be distracted by the interface.