those games are built around the idea of exploration and making up your own character in a sense.
I get what you guys are saying with this, but it honestly sounds like a cop-out. It is possible to do something when you finish the main story line, and THEN go do the rest of the quests. My point is they did nothing. Games with sidequests do it all the time. Finish the game, have your ending, and then allow you to finish everything else.
Anyways, I didn't want to wax poetic about Skyrim, necessarily
One series that a lot of times can do too much with their endings is MGS. As if there isn't enough political dialogue in the game to get you lost. Let's do it for another 30 minutes and leave you scratching your head some more. Or just not caring.