I don’t think that’s the only point, although it is true that the ability to test purely phenomenological hypotheses scientifically will probably always be frustratingly limited. Another problem is that no matter how refined and precise and exact one gets in the observation of one’s present experience, it is hard to see how one could draw conclusions about the future from such knowledge. Either one must say the Buddha could literally see the whole past and future - which has nothing to do with the precision of present moment awareness, or else one must argue that the contents of present experience contain sufficient information that one can deduce from them all of past and future history.
Anyway, while these are fun hypotheses to wonder about and kick around philosophically, actually believing any of them given our current state of knowledge seems like wild speculation. And tying one’s spiritual progress up in the quest to get answers to such questions seems utterly quixotic.