Well, the infant Church needed a boost, did it not? God saw fit to work many miracles to help establish His Church.
But miracles do still happen. When you consider all the people canonized by the Church, you have to realize that “first class” miracles were needed to proceed to their canonization. Then there is Lourdes and other sanctuaries. Blessed Brother André in Montreal (died 1937) worked hundred of miracles everyone could see. ILf you go to St. Joseph’s Oratory in Montreal or to St.Anne’s in Beaupré, you can see hundreds of crutches and orthopedic devices that people have left after being cured.
But, as hinted above, the mosts astoundng miracles happen inside people, where God has worked on their hearts and minds.
And the greatest miracle of all, the Eucharist, happens every day.