Because they are not perfect and you need control of where they go. They don't always get it right and you might have to correct them. At least none of the sol

Because they are not perfect and you need control of where they go. They don't always get it right and you might have to correct them. At least none of the solutions I've found been 100% perfect. So I much rather have the computer do as much as it can, then I correct if it gets it wrong. Collaboration with the machine is better in this case.