I say let them serve while married. Having a supportive partner will help stabilize that priest.
I would guess it’s more difficult to remain chaste in today’s world than it was hundreds of years ago. The internet has made the world a much smaller,less naive place.
We are close to several priests and see how all-consuming the life is, total devotion to the service of the people of God. They barely have time for decent rest let alone a family life. They hang out with us and other friends for support. Last week one friend had a long day then came a medical emergency so off to the hospital, the lady forgot something she needed, would he go to her house and get it, yes, of course, other people see a priest at the hospital, they ask him to come and pray with their friend/family member, go home, oh wait, the lady is being discharged at 3 am, could you come get her, of course. He maybe had two hours of sleep, maybe, before he had to get up and do it again. A wife and children would always be second place. All of my priest friends are vowed to serve the people and they do 24/7.