4-matic, Hydramatic with 3, Dynaflow with 2, or CVT with one. Why so many types of transmissions to do exactly the same task?

Automatic transmissions come in various types and are more of a way to take control away from the driver than anything else, it allows the most inept driver to be able to operate the vehicle and thus allowing the manufacturer to sell cars to people that are unable to apply brakes, use a clutch, change gears and steer the car at the same time when going through a tight turn. As for the CVT being a BMW creation?? I think not, it has its basis in the humble DAF variomatic, which was quite reliable and had the least number of moving parts of any transmission.