To me, some EP's didn't execute their theme well and/or their features weren't big enough, as opposed to most of the GP's. Also, some GP's add big gameplay features like EP's, but are cheaper. Sims 4 EP's lack, and I mean LACK content, and variety of content. In a TS3 EP you'd get multiple new gameplay features, on TS4 you only get one, two max. Seasons was one of the exceptions where we got multiple new gameplay features, weather, holidays, updated gardening, and for the first time on the sims, scouting, for kids and teens, also the first children's after school activity.