The other classes previewed don’t have an active ability added (aside from replacing one), but this one does. The early look preview states they don’t want to burden the player with more buttons to press. Please consider replacing a current ability instead of adding a new one, not just in this tree but all the new talent setups.
Dragonflight button bloat has led me to drop other classes I liked because of too many required active talents. One of the reasons I main a hunter is fewer main buttons in the main rotation and I’ve already added some this expansion.