1) Your path to where you want to be is a thumb print, not a blue print. The problem is that with fitness everyone is looking for "the" the way to do it. Its totally inconvenient to us that they wa that worked for our friends or our sister is not the way that will work for us. So we actually have to figure it out ourselves. And it may be totally different than everyone else. Your fitness plan is like your thumbprint. Its unique to you.
2) To make it even more elusive to someone who is searching for the one program, its like a thumbprint that changes as you age! Your circumstances change, your body changes, your preferences and environment change, so there is no way to prescribe a cookie cutter program or blueprint that accommodates all of that.
That is why, no book or program will ever be the last one. There will always be another unique approach, just like thumbprints.