Exclude from Project, why I can't do it for a folder?

Under pressure I guess so, I reckon it’s great to have ‘Exclude from Project’ back again. But why oh why I can’t exclude a folder itself?

I want to keep a structure in my project, and I need to keep this specific folder under another project. But I don’t want to compile it. Now I need to exclude all the files ‘manually’. I have some images subfolder inside plus a lot of other subfolders, so imagine the job to exclude the files.