Which element from a DLC should TS5 include in base game and what are replacing them for DLC

While Pets and Seasons are an absolute necessity for a realism player, there still are people not enjoying them - and making them baseline would require adding a set of switches to the settings to turn them off.

For me, it'd be the Parenthood pack - without it, raising children was far too simple. And Calendar from seasons, that's just a gold feature (though I'd appreciate being able to set Monday as the first day of the week instead of Sunday, and 24hr mode, because I am a European player).