I assume you are saying add plantarmor back and add the past plantbending addons to core, to which my response would be...
Plantbending is a very narrow subject, most of what happens with it is draining water from plants because its easier to bend the water than the plant. And Adding back moves just for the sake of reviving a sub element is not the way to go, especially when other things could be focused on (like the element itself). The time spent adding moves could be used to make the actual plant sourcing more realistic/fluid, which would overall be a better change to plantbending than re-adding plantarmor or vinewhip in my opinion.
Plantbending isn't used or seen as much in the show for us to constantly revise and give it new features, we see really 2 things. People bending vines, or people bending the water from vines and that leaves us with very very limited options.
Sorry
Denied