I have long wavy/curly hair on the top of my head, and keep the sides + back short. Been poo-less for the past six months. My hair looks and feel great, and doesn't smell like anything. No issues with hair knots any more. Took about two months for my hair to normalize after going poo-less. I basically massage my hair and scalp under the hot shower to get sweat, dirt, extra oil, etc, off, and that's it. My hair keeps some of its natural oils afterwards. Showering every 2 days is a good cadence for me, I'm fairly active, and poo-less I spend a lot less time showering. A shower for me takes about 5 minutes, and have no guilt taking a maintenance shower (post-workout, going out, etc).
My spouse had absolutely no idea until I told her about two months ago; she thought the practice was "gross." I occasionally work in a little scented oil for aromatic effect so she thinks I'm back on the 'poo wagon. After much pleading on my spouse's part I did fully shampoo my hair with a natural shampoo last week; my hair was so dry and fragile afterwards, looked terrible, and it kept getting stuck in my hair brush. Took a few days to get back to normal. I have some knots and frayed ends as a result.