Controlling nature and loving nature are not mutually exclusive, and in case you hadnt realised, the night elves can also be perceived as controlling nature. Depends on your point of view. So i wont use that as a reason to disqualify an entire race, especially when they can have enough indivduals that want purely devote themselves to their love for nature.
A purist would say, purely letting nature have it's way means not enhancing and directing it, which the night elves do a lot,,
they moulded all of Val'sharah to reflect the dream, not to mention growing world trees all over, none of these occur in nature, and using moonwells to power feed their forests or wisps to regrow and heal dead trees or branches it's what elves do, and you could argue that they are not letting nature be.. Tauren and trolls would never be so vain or bother, they don't love nature in that manner.
To be honest, the night elves never once had a go at the high elves for the condition of Quel'thalas forests, wanna bet they would have found Eversong far preferable to any other forest any other race dwelt in save for the ones they tended. It is players that are looking for excuses to explain blizzard ignoring elven druids, where truth as @
Mace said, blizz prob just didn't focus there or forgot to consider it, yet we jump on the bandwagon always trying to explain for them every reason why something is the way it is, esp when they haven't explained it, I think they probably just forgot about this fact.