Why - several reasons. It means I go to one place to look at this data, and its presented in a consistent way. It also helps try to drive meaning from all this data by looking for correlations and commonalities.
Did it bring improvements. For me its helped me get in shape, its helped me find things that have a knock-on effect to my mood and/or productivity.
Even water? What if you're thirsty? Any sources?
"I strongly recommend moving the last intake for the day as far away from bedtime as you can. 3-4 hours is ideal, but at least 2-3. This increases the length of the "fast" which in reality nighttime is - broken by breakfast. Using this method consistently is one of the most effective ways to lower body fat - and it doesn’t take a lot of effort"
To me it sounds terrible. It's no secret that work-out length and level of intensity hugely, hugely depends on your mental state at the moment. For instance I recall good old days when I tried impress good looking ladies in my gym and easily pulled/pushed heavy weights that I wouldn't do normally(how silly it was!). Another example is if I face some minor issue that I am worry about(annoying neighbours, upcoming promotion, et) I can't work-our efficiently enough, even being in the perfect physical shape. No fucking Alexa/Siri/Home can detect that. And if one day it is able to do that then it means that the AI just took over the world. Thanks, but I will continue my silly-no AI-most effective approach to the healthy life!