Look out, Sims 5.
Whoever thought this is a good idea needs to have their head examined.
Im under impression that Paradox saw that mods are keeping Sims 4 afloat and that the plan is to just make a bareboned but very easily moddable Sims clone. This dialog system is probably one of many features that the devs put in if someone wants to make scenarios, quests, plotlines with dialog choices. Basically its seem more as a building tool then something used directly in gameplay.
But how knows maybe I am wrong.
Combining how The Sims is monetized with how Paradox does business is a recipe for something truly cursed.