I think the question is far larger than mystical experiences, but all experiences, be those mystical, or daily mundane experiences, or the experiences of one's own thoughts and ideas. Is more nuanced and subtle points of view to any and all of those wiser than black and white absolutist points of view? I would say certainly, yes. It shows a higher level of maturity and sophistication of thought. Black and white absolutist thought comes before more subtle and relativistic thought, as the differences between concrete operational and formal operational stages and beyond follow on a general developmental line, from earlier to later, simpler to more sophisticated.
So someone who is very black and white, absolutistic in how they translate the world in general who has a mystical experience will very likely see it as validation of their absolutistic points of view. They met God and he is the God of their religion, proving that all the others and their experiences must be lies, false, or deceptions. But someone who is relativistic in their overall thinking will take the same mystical experience and understand it as validation that Love is universal for all.
So since it is wiser in general to have more sophisticated frameworks of interpretation, then it would seem spiritual growth would involve not only state experiences of the mystical domains, but structures of thought themselves in general in a developmental line. The mystical experiences are the same, but how they are held and interpreted depend on the structures of develop the person is at in general.