It was created to introduce more offense into baseball and generate fan interest. After 44 years it has done so little of the former it failed at the latter. Therefore, it is a failure. In fact, it has made baseball a bit more boring. Time to end it.
You're right. The designated hitter makes no sense, except maybe in the paralympics and the special olympics. In MLB action, it's better to stick to having the same nine batting running and fielding, like they do in the other half of the MLB already