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Time cannot be altered at will, and the more powerful the world is, the more this is the case, especially when it involves powerful beings.
Thus, before reaching a certain height, the difficulty and cost of 'killing the past' to then 'kill the now' far outweighs directly taking down one's enemy head-on.
Therefore, although future Time Dragons can travel through past and future, they cannot arbitrarily change what has already occurred. They can observe the future but cannot determine which future is the true one, or if none of the futures they see are the real ones, it is merely a negligible possibility that cannot even qualify as a Prophecy; they can glimpse into the past, but it feels more like watching a film, and if the entities involved surpass their own power by too much, it could even cause the 'film' to blur.
