Has super every been included in a game and wasn't dlc?
Only in DBFZ.
Tbh it's understandable, it doesn't make sense to make games or content for super because it's not long and you can and should watch DBZ before watching it anyway.
Imagine being a kid whose never heard of DB and picking up a Super game, and then trying to watch Super. There's a chance they could get into it but it's way less likely to hook them than if they started with Z or the original DB.