IndigoWaves
I think that it comes down to how certain a reader feels about his/her own impressions... Whether or not they are seen as unalterable "Truths", likelihoods, observations that are subject to change with additional data, etc.. I don't think that less-than-decisive wording necessarily renders a reading worthless; some (most?) people will still believe what they want to believe, anyway, no matter what words are used.