The standard joke used to be "Just play everything in C to avoid those black keys." And then up comes a dominant 7th and blows that whole theory up.
Make no mistake, I didn't select Dom 7 chord spellings to examine because I'm some kind of "arsonist" that wants to blow things up. I'm just a struggling hobbiest that once wrote a song with such chords, liked the sound and want to play better bass. I need to move beyond root-fifth.