In ZorinOS Lite imo its three: Appearance, Windows Manager & Zorin Appearance.
Sorry if I wasn't clear but yes, I'm mainly focusing on the user side. Perhaps stating application may be incorrect, and GUI may be the better term to use.
Also if I recall, ZorinOS Core does not comes with gnome tweaks. This makes Zorin-Appearance the only GUI to change themes, making changing themes a very clear way to do so, even though its just Zorin presets.
Yup, I feel choices do add confusions at times although in XFCE's case, having appearance & windows manager together may be a necessity instead, depending on the theme.
Maybe I have been focusing on the user's experience based on the defaults too much, I have no idea. But my philosophy is, choices adds confusions. Hence only the necessary choices should be exposed, and the others should be tucked under an advanced option.