You were imprisoned because you got caught by accident in an ambush intended for someone else. How does that in ANY way define your character? You could invent a thousand and one reasons why you were crossing the border how does it define you in the slightest possible way. It doesn't you could have walked out of your shack to take a piss. In Morrowind you enter the region by boat counts thats crossing the border. Especially as the Emperor had you sent there so you would meet the criteria of the Nerevarine. Damn Septims and there visions of destiny. So don't act like Skyrim is doing anything knew with its introductions.
Your making mountains out of grains of sand
And with each questionable development decision by Bethesda is like a grain of sand, each purchace we inherit the desert.
Either you do not RP a game like I do, or as an RP'er youself, you don't mind having conditions like these determinded for you. My beef is that the reason for my character's imprisonment was pre-determinded by the dev team. It wasn't determined for us in the other titles. Perhaps I assumed that we would start in a prison cell (or a boat's compartment space) again... sadly, it was neither this time around.
So starting off crossing the border had already defined my character... before I even had the chance to use the WASD keys.
None of which have appeared in any previous elder scrolls game. The line is drawn, Your not native to skyrim. Your never native to whatever region the game takes place in. Evident by the fact your the mysterious figure of destiny who came from nowhere. Giving the option to be from the region means they either have to define your history or your from that region and you have no history anyway.
If it were me and I wanted to claim "be who you want to be" and "in another life in another world", I would look at all possible angles of freedom. Granted, the ES series does that better than anyone else, but there's always room for growth. If a player wants to be a native in whatever region the setting is in, they should have the freedom to do so. That's why I'm suggesting the idea of developing character backgrounds to fit with the games theme and setting. No harm in that, is there?