>If other's had listened and responded with your type of thinking, we wouldn't have, automobiles, airplanes, antibiotics, computers, etc. I'm glad they didn't.

If automobiles weren't backwards compatible with the roads that carriages used, they would have had a much tougher battle. Same with airplanes, at least somewhat mimicking the controls of automobiles. Computers didn't take off until they mimicked typewriters and tvs.