Steam-only? Well, no chance of getting my money then.
Yep, they probably don't care. Yep - I don't care that they don't care. Still not getting my money. :)
Colossal Order do care, they're one of the friendliest devs in the business (in my experience, that is). I am quite certain it's Paradox's call to have it steam only.
But logistically, it's easier too, since there's gonna be DLC and the game has integrated mod support.