We have vision algorithms that are able to tell that a picture is a picture of a horse, why do we still need the alt attribute ? We have the level of knowledge

We have vision algorithms that are able to tell that a picture is a picture of a horse, why do we still need the alt attribute ? We have the level of knowledge to build a tool that make website accessible, so my opinion is you need that tool. It is easier to build one accessible tool than to ask all developers of the world to put an alt attribute and respect the h1, h2 naming