Believes not. Switched up the usual gym formula in Alola. Introduced different battle styles like Triple, Rotation, Inverse, and Max Raids. Added gimmicks like Megas, Z-Crystals, and Dynamax. Designed Pokemon with multiple superficial forms like Deerling and Vivillon, as well as functional variations like Alolan and Galarian forms. Tried more substantial changes with Let's Go and Legends: Arceus. Stuck in smaller touches like playing with your Pokemon in Amie/Refresh/Camp and trainer customization.
Sticks close to the original formula, yes. Does not mean new ideas have not appeared.