I can’t say this makes complete sense. Workspaces and projects seem documented as being the same (lists of folders and files). Solutions seem like difficult-to-specify lists of commands to build a product.
What I would like to support my projects is like your Workspace plus the ability to execute commands, open a folder, open a file, browse to a file, and execute a Windows system command by putting the cursor (caret) on a string in a file that contains the command or file and pressing a key. Also it should be possible to edit the folders and files in a project, open more than one project at a time, and group tabs according to project (or at least have separate windows for each open project).