I agree with whatsercurl. I think porosity may be "the" factor. My hair is fine and has low porosity (I think.) I can use the heavier products and not weigh down my curls. My fine curls are also lazy, I always thought I was a 3a in summer and a 2 in winter. Now that I have the products and technique--most would say I'm a 3b when I'm done my routine. Of course, going out on these windy cold days with single digit and negative dew points isn't good for anyone's curls!
3a (Corkicelli), highlighted, fine, low porosity

HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me, Aloe Fix