Would that really be so bad? Unless they reduce barrels/elemental arrows/healing food (which I hope they do) you don't really need a balanced party in this game so far.
People differ in how they like to set up an adventuring party. Some might like a party based on likeable characters, and class or balance be damned. Others (like me) enjoy using a certain combination of skills. It's not about balance, but the fun in using those skills in combination.
For example, in my current EA game I'm playing a Rogue/Thief main character along with Laz'el, Gale, and Shadowheart. That's basically the classic "Holy Trinity" of Tank, Mage, Priest + 1 Utility character. It's a trope, but I like playing it. If I lose one of them, I'd like a close replacement.
That's just me, but I suspect a fair number of other players will want a class-based party and not be railroaded into some odd combination based on companion personalities and who you can keep from staying or leaving.
