Well I always think that basic relationship interactions in a "life simulation" game should be available to everybody regardless if you own the pack, because you know ..... that's part of life.
That would be like only the rich and wealthy people (AKA those people who purchased a pack), could be the only people who were able to slow dance in RL.
So, yeah it absolutely should have been patched into the basegame, but this is TS4 we're talking about and the packs are so tiny already, if they took it out and added it to the basegame, that's one less gameplay interaction that pack introduces, and it already has extremely minimal game play outside of planning a wedding event.
