Indeed but consider the case of someone abandoned so her his or her spouse leaves the abandoned spouse with young children. (S)he remarries young to a new spouse who accepts the children, and is a good parent to them. Now the couple,perhaps one or both lapsed, want to return to the Church.
Perhaps you think it’s easy for them to just turn off their sexuality like a light switch. Illness is one thing, perhaps the illness also kills the libido. But two healthy people is another matter.
For the sake of argument though, let’s assume the couple want to live in complete continence, but find it very difficult. How do you propose to deal with this pastorally without the benefit of sacramental grace? Basically all they can do in Church life is sit in a pew, pray, and watch others access sacramental grace. They cannot even avail themselves of confession, a wonderful sacrament which when coupled to the Eucharist, allows one to grow in holiness. But our hypothetical couple won’t have any of that.
We are essentially saying make yourself well before entering the hospital, but you’re free to come in and watch others get well. But don’t expect any medicine because you’re a special class of patient.
This kind of rigidity in application of doctrine makes as much a mockery of the doctrine as the Pharisees made of The Law.