Internal reviews and testing probably made it clear this one doesn't have the legs to warrant multiple DLC additions.

I’m already bored of it after just a few hours.

You just became the school kid that reminds the teacher theres a quiz on the day you aren’t ready haha

Hell is a Nintendo that knows how to offer Pokemon as DLC.

Maybe Nintendo are testing the water, and then BOOM! Mario Kart and Smash Bros. is all out DLC and IAP.