Open New File with Limited Color Palette
Include an option in the New File dialogue box to open a file with only black and white color swatches. Currently, new files open with a large palette of useless color swatches, and it's a time waster to have to delete all those colors each time to have a clean and functional palette.
Egor Chistyakov commented
You don't need to have this option, really. Just trash all swatches, styles, brushes and resave this new document as a default profile (in a separate folder first) and then copy it over existing one. Access the folder by clicking Browse option in Profile dropdown in New Document dialogue.