I would genuinely be interested to know whether using and charging the battery in a certain way actually makes a difference to the battery health beyond the optimisations the operating system already makes. It's difficult to work out because you would need a very large sample size of identical devices with near identical battery chemistry and use half of them with the 'battery health saving' techniques and the other half without those considerations. I am of the opinion if people just used and charged their devices in any old way, the battery health of the device would be basically identical to what it would have been if they were taking care of it. That is based on absolutely zero evidence and pure conjecture.