I see the elves as being mythic archetypes living in the world of Tolkien and interacting with mortals which is what makes them "other". That is a distinction that is very important to Tolkien's lore and this "otherness" in being immortal and taller than normal humans is part of what gives them their "ethereal" or "otherworldly" nature. It also means that they are not technically supposed to be seen as a literal "human" type race but as a fantasy race with mythical attributes. This same kind of trope is found in the Elves of WOW but they have many different types of skin colors, like pinks and bluish which just shows they are a fantasy race and not intended to be taken as simply real world humanoids. The lore of the 3 ages is that the first 2 ages are the times of myths, legends and larger than life heroes, villains and battles while the 3rd age is the transition from that mythic age to the age of normal mortal men, as in real world men. And the 4th age is that story of the mortals going forward, where the elves and so forth are like the literal gods and demigods of our historical mythology if they actually were real at some point in the ancient past. Other franchises have elves as just another mortal race with simply more affinity to different schools of magic,who may be ancient but still just mortals. And this is why there is so much more diversity in the depictions of elves outside of Tolkien in general because they have a wide variety of settings and backgrounds given the wide variety of fantasy settings created in high fantasy since then. But yes, that look of Tolkien elves is supposed to reflect his intentions for them as a race and not simply as some generic template from a MMO character creation screen with infinite options for appearance. That really isn't Tolkien at all. Heck even with that "Dark" elves have most often been depicted as darkish grey or even brown but still with that distinct elven look with the long straight hair and ears distinguishing them as a fantasy race.