Look, I don't agree with changing the classes of the origin characters either - and while I do think you should be allowed to take them back to level 1 and respec them from there - it's ultimately not up to me how other people play this game in single player.
AND we don't actually know that we can respec the Origin characters to a new class - we know we can multiclass them - but it would be a very odd choice to change their initial class because I feel that would break a lot of story. However, I don't really know.
Nevermind - apparently you can change the origin classes.
