First of all, your assumptions about "they are in some way fundamentally unanswerable" and "any 'in universe' explanation is going to be highly debatable" are completely wrong. Pretty much every single question about a large and complicated universe like Star Wars is more likely to contain a (possibly ret-conned) in-universe answer from EU than be unanswerable, from my experience. Those specific questions might or might not have an answer, but fundamentally, questions like that ARE quite answerable as a class. (on a tangent - same for Harry Potter, where I saw many questions dissed, DVed and VTCed as unanswerable speculations, only to see myself or Slytherin come up with canonical straight-from-JKR-interview answer immediately).
I could may be, possibly, consider your argument for a small SFF work with no other material to draw upon as worth thinking about. But for Star Wars, this is a silly assumption to have been made.
Second, if you have issues with a type of "What is an in-universe explanation for this seeming plot hole" questions, I would recommend reading excellent answers to a related Meta question here:
Movie Magic (or how do we answer stupid questions)
(spoiler: most people's consensus was that such questions aren't "stupid" and perfectly on-topic). While the question itself differs slightly from yours, the answers are just as applicable in their logic.