You left out many, many Christians across centuries and other traditions besides the less than two-century old newbie SDAs. (And SDAs were not even Christian until they recognized the Trinity, not all that long ago.)
Because it reflects the reality of exactly how God created the marvelous diversity in nature. It does not depend upon demanding that the Bible, full of parables communicating theological realities, be scientifically correct in the 21st Century. That is illogical, right up there with flat-earthism idolatry.