Yes. I agree. The World Celebration (current version) redo has a number of problems - but adding greenery isn't one of them. Even if the had left the original Communicore plaza alone, it certainly would need a refresh by design standards (though the FWW/World Nature side has held up better than you would expect).
I am afraid of bottlenecks with the design (part of the justification for the plaza of Innoventions). But, that can be solved by the World Nature and World Discovery entry points creating new access points beyond the central plaza.