No idea how Super Paper Mario got labeled as an Adventure game and this didn't.
Calling it an RPG is misleading. It does have some light RPG elements, but many adventure games do.
Super Paper Mario was sort of an Action/Adventure RPG imo.
Sticker Star has turned based combat, non-real time combat strategy, health upgrades, inventory management, etc. In other words, it has many of the mechanics that people think of when they call something an RPG but without leveling, XP grinding (perhaps replaced by coin grinding), weapons, armor, or many of the things people commonly associate with RPGs.
It's definitely a different take on the genre, but there is a lot of fun to be had if people play with an open mind. You have to develop new strategies than ones you might have relied on in typical turn based RPGs but I've felt experimentation has yielded more rewarding results so far in this game.
I sense a great disturbance in the Force, as if millions of voices groaned in disappointment and were suddenly biased.