1) I think Larian hopes to put in a system to let you change the default classes of OTHER companions when you recruit them, so you can pick what you want and change them to fit the party.
2) You just complained about discovering that your other party members are the same archtype as you are, now you're saying that you hate the idea of respeccing them? Sorry, but in my view, even if it hurts your immersion briefly, a companion respec-on-recruitment is a better way to handle it than setting a default for the origin characters and discourage you from making your main character what you want it to be.
I understand how those two points might seem a little contradictory. As I see it, you're going to have a couple types of players: folks who want to spec out everything and then folks who want some smart defaults so they can jump in and play.
The most natural place for speccing out early recruits (the ones you can get within the first 5-10 minutes of gameplay) would be in character creation. It's not like the first few minutes of the game require you to have only one character - why not give advanced players the option to start with all four from the beginning? They get what they want without a jarring second/third/fourth character creation for immersion players or new players who don't yet have a basis for making those kinds of decisions.
Two possible counter-arguments (depending on what's in store in following acts):
-There may be more recruits later in the game and this doesn't account for those. At that point, they could either give you a bunch of options (ala Hall of Heroes in DOS1) or maybe you don't need more recruits, but they're available.
-If you are using an origin character, the feel of the game so far is that you have a main with some recruits. You need them all to work as a team, but your main character is really the one you care about. If that will be true for non-origin characters as well (I haven't played one yet), then it might be problematic to start with four equally-main characters.
