Yes - in other words - they may believe - and even get the world
  to believe them as objective truths but the reason they're not
  universally agreed upon is because - as comprehensive as many of
  these systems are, they are, ultimately, a perspective - no
  matter HOW thorough. I'm thinking of even the big things like
  mathematics + things that are widely useful in describing
  reality. Yet there are always gaps that are better filled in by
  other things. I'm trying to identify the sources of those blind
  spots.