Well for one, there has been no validated evidence to support the notion that certain miracles still do occur. I’m not say God cannot do these thigs, I’m saying He choose not to. The Apostolic age was unique as it was the founding of what would be become the Church. Not only did the Apostles have to deal with the traditions of Judaism and the religious elite of their day, but with very hostile gentile nations and cultures. Nothing had been codified as far that the NT was concerned, so God used these men and gave them special gifts to carry out the ministry that would eventually lead to their deaths. Since no written word had yet been given, God used them to convince people that they were indeed commissioned by Christ. That’s another reason I have a difficult time accepting people’s testimonies about having spiritual gifts. Jesus Himself, face to face told these men what they would do and receive. Jesus speaking to you directly in a physical and audible way is unprecedented. It just doesn’t not happen randomly.