Nice analysis of what sounds like an interesting and relatively low magic (etc.) system. I too prefer something less “Class” oriented than standard DnD though I approach that in a different way in our character generation system. I wonder why their supplements appear and disappear like that, perhaps some kind of licensing issue? Do they mention Game of Thrones specifically in the game?
Game of Thrones actually first came to my attention on when some people on the old forum mentioned it as a good fit for Codex Martialis, this was quite a while back before the HBO series started.
Have you ever seen the Burning Wheel system?