I mean the Second Vatican Council.
Oh, I don't regard it as a "Council" but that is a subject which ought to be discussed in another sub-forum...
But nowadays, in a world drenched by softness, comfort, decadence and ever present temptations...would it not be even more suitable to have recourse to the discipline?
This is true. However, the effeminacy and cultural perversion that you have mentioned have deteriorated the true notion of penance and mortification to the point where those practices such as the discipline, the cilice, etc., ought to be adopted until the individual has the correct notion of
interior mortification, and has given himself over to the earnest practice thereof.
It would be foolhardy and rash to take the discipline or put on the cilice if one has failed in mortifying little egotistical impulses that are often very subtle and hidden, and are even to be found in exterior practices of piety in a great number of cases. This is why the active and passive purification of the senses is necessary in order to attain to that self-detachment that is requisite to enter unto the higher apices of the interior life, where charity is thoroughly purified of self.
The discipline ought to be reserved for those souls who understand well and practice the teachings of such great masters as St. Louis Marie de Montfort regarding the mystery of the Holy Cross and our ineluctable obligation to carry it after the footsteps of Our Lord. Even then, the counsel and consent of one's Spiritual Director is necessary in order to safeguard the practice from spiritual vainglory (since it would then be done under docility and obedience).