Knowing has never been the hard part.
Information has never been easier to get. Results, devices, experts, protocols, a hundred articles saved for later. None of it answers what to actually do today, with the life you have. Health is decided in the long, unglamorous middle, and that middle is the part nobody is responsible for.
Advice built for an average fails a real person.
Most guidance knows nothing about you. Not your history, not your symptoms, not what your week actually looks like. It was written for an average, and there is no such person. Women get a sharper version of the same problem, since a great deal of what is handed out as good practice was demonstrated in men.
Direction is worth little if you cannot hold on to it.
Consistency falls apart for ordinary reasons. A bad stretch of sleep, a demanding month, a routine that stops working. Anything that cannot absorb that is not a plan, it is a recommendation. So the work is continuity: starting from the person rather than the population, adjusting as things change, and making the effort something people carry with others instead of alone.