While I am curious about why the Doctor left Gallifrey, and would like to know a little more, I realize that I really DON'T want it all laid out because I am not sure any explanation (no matter how creative and clever) would ultimately be as satisfying as I would like and the reveal would remove some of the mystery and magic (dare I say) of the character and of the program. It is somewhat like peaking at any thread here marked 'SPOILERS' to get just a
little more information, but then being disappointed when I've unintentionally gone and read TOO much.
I can make somewhat of a comparison with my interest in the nature of the TARDIS (being one of those folks who buys the technical manuals and used to memorize blueprints). I have wanted to see more of the TARDIS interior for years -and have been happy to see more rooms in recent series (esp. the Library, and a brief peek at the pool) - but I have to admit that I am of mixed feelings about the 'giant Christmas Tree with the magic bulbs' that is the basis of her ability to create and rearrange matter (and manage her own internal design) as shown in "Journey to the Center of the TARDIS". I even like the captive star as shown in that episode as powering the engines, but I was not so much sold on the 'tree-thing' (if I may call it that). Seemed like it should have been something more monumentally incomprehensible to us lowly human viewers. Careful what you ask for, right?
Then again, the Moment looked like a medium sized box with gears. I tried to explain to my sister (who never watches any TV anyway!) that there where a lot of higher dimensions wrapped up in there in that 3D aspect of the weapon, but she did not care to explore the concept and realize why advanced Time Lord tech would look like a gear box! (I wish she allowed a little more magic and wonder into her entertainment!).....