@Gargron as many have already said, it’s a great way to bring the material to a new audience.

I also think people put the original show too much on a pedestal. The show being animated is not the only reason people might not be watching the original. Compared to “adult” animated shows like Arcane and Castlevania, Avatar is quite cartoonish.
I’ve recently finished season 2 which I really loved, but season 1 could’ve done without much of the slapstick humor aimed at kids IMHO