Yep. Some people might argue that this or that mechanic should be in the base game because it's too important, but in general the Paradox model is great. Games get interesting new content many years after release, which you have to pay for, but it enables Paradox to actually do the work. The latest DLC for Hearts of Iron 4 took more than a year to develop and drastically changed the game ( it added logistics, trains, depos) for the better. If it were not paid, they wouldn't have been able to afford it.