The teleporter in Star Trek is a necessity for the crew and the famous Captain Kirk to get back and forth from the planets. Since the ships that are used for travel are built in space with out and gravity acting on them the ship would not be build to handle gravity. Nor would it be able to leave the atmosphere. The warp drive is a necessity for the Star Trek universe since the expanse of space is so huge. The time it would take for any ship to go between any star would take so a large amount of time that all of the crew would have died.