Your statement is untrue. I read an article of one mother who insisted on seeing and saying goodbye to her young sons corpse.
Identification was done via facial photography by the coroners office. The coroner said as much in his first public interview.
One would think every one of the parents would have insisted to see their child one last time. Was this mother ever allowed to actually see with her own eyes her son? If she was allowed to, it seems likely the other parents would demand the same, would it not?
I saw the coroner say in that interview to the press he has ‘very good photographers’.
My understanding from prior homicides is that anything other than a visual inspection by a family member or close friend is not legally considered a positive id. The only exceptions are if literally nobody acceptable can be located and make a physical appearance.