Young Marriage

I understand marrying children has been allowed but according to Imam Shafi or the majority of ulema, if there is no valid reason is it discouraged or haram It should be noted that al-Shaafa’i and his companions said: It is preferable for fathers and grandfathers not to marry off a virgin until she reaches the age of puberty and they ask her permission, lest she end up in a marriage that she dislikes. What they said does not go against the hadeeth of ‘Aa’ishah, because what they meant is that they should not marry her off before she reaches puberty if there is no obvious interest to be served that they fear will be missed out on if they delay it, as in the hadeeth of ‘Aa’ishah. In that case it is preferable to go ahead with the marriage because the father is enjoined to take care of his child’s interests and not to let a good opportunity slip away. Further seeing as its frowned upon by society today, is it correct to say it is no longer permissible or valid