These should be taken as the hypothesis statement at the start of an experiment, that will or won't be borne out by what actually happens. Show, don't tell. One reason: People can be wrong about themselves. Or they can, with varying degrees of either idealism or self-dishonesty, present a rosy view that amounts to little more than a sales pitch for themselves. If it's true, you'll find out soon enough. If it's not, you'll find out soon enough. Therefore these documents have little value and should be kept to the minimum length needed to discuss practical things like email expectations and overall goals - things everybody has to agree on.