[Gorthaur the Cruel]

So we all know that the Three rings were regarded as supremely beautiful and the powerful besides the One. But when recalling the powers of the other sixteen (the Nine and the Seven), they seemed to only affect on a personal, individual basis (invisibility, enahncement of prestige and power, stretching of lifespan), whereas the Three, could produce enchanted enclaves, affecting flora within a certain radius. So does this mean that the Three could actually ward off the fading of the hröa of the elves on a large scale basis?

We know that those men who wore the Nine were "stretched." And if the elven rings were originally intended for the elves (before Sauron took them), perhaps the Nine and Seven had the power to halt the fading of the hröa of their wearers only, and Celebrimbor thereafter made more powerful rings (Three). And that's why Sauron wanted the Three, of all the elven rings, for they could ward off the fading of the hröa of those elves within their radius (e.g. Rivendel and Lorien). Or is this speculation completely wrong, and that the Three merely halted the decay of the flora but had no power to stop the fading of the hröa?