Rinse-off conditioners work to “flush out” excess shampoo by sealing the outermost cuticle layers of the hair. I know that. But I still skip conditioners because it leaves my hair heavy.
My hair is extremely fine. Occasionally, I don't put conditioner in it, either because I mis-shopped or because I feel I want to see what will happen. It's always a disaster. My hair reacts badly to the heat of the hairdryer (too knotted if I don't dry it) and just looks kind of frizzy. I would have to put more shine serum on it to get it non-frizzy and too much of that just makes it look greasy.