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It's just the way that Steam is set-up as to why you won't be able to buy Sims 4 base game on Steam and buy any of the Packs for Sims 4 through Origin. I'll give you another prime example Conan Exiles, it turns out that you can't buy the Steam EU or Aussie version and buy the US version of the Conan Exiles DLC's and have them work together. And the reason for that is, and I have heard others say this as well. It has to do with the way the game is coded. The two versions will have the same line of codes except one small line. And that one small line of codes can prevent you from buying the base game from one place and the DLC's from another. Now this may or may not be exactly the case for Sims 4, but it is a strong possibility.