It's simplistic to say that anime just can't be made into live-action. Some filmmakers have used anime-inspired techniques and story beats in very successful movies. The creators of The Matrix were inspired by Ghost in the Shell, and the creator of Black Swan based it on Perfect Blue. One can see very clear parallels between the anime and the films. These and other movies show how good filmmakers can translate the best of anime into the best of live-action.
In addition, live-action anime are starting to pick up success. 2019's Alita: Battle Angel became a modest box office success for Fox; a marked improvement over its other adaptation predecessors.
Alita can perhaps represent a new trend for live-action adaptations, and may be the first in a new series of great films. Only time can tell whether that will happen, but to dismiss the notion out of hand is unnecessary.