It’s because, and no offense to anyone who likes the movie, it looks bland. Especially when you directly compare it to all the competition that came out or will arrive within the past year. Puss in Boots, Spiderverse 2, Mario, Ninja Turtles, even the upcoming Migration all not only look more interesting visually than Elemental, but also proven to be more interesting stories than Elemental so far too.
Elemental just seems to be another Zootopia or Inside Out. Why watch that when you have the originals?
You’re welcome!