Season passes are a thing that works with Paradox because they're guaranteed to release several times more DLC than they promise with the season pass. People have no complaints about it because when Paradox fails to provide the value promised, they extend the season pass to cover more DLC/content packs until it meets (or potentially slightly exceeds) the promised value of the season pass. It's far less self-exploiting than paying for a large number of early access games are; sure, Early Access games on Steam might exist, but a large number of them could be anywhere between a tech demo and a working game and be meant for nothing more than to trick people into giving the deveolpers money before they jump ship since Valve set up Steam in such a way that if they do this, most of their "customers" won't realize it until well after the refund period lapses. With Paradox, if they say "X number of DLCs will be released" you can bet they mean "this is how many we can come up with at this exact moment" and that a lot more are on their way.