Only if you assume that God would want to show Himself to everyone.
However, there are a couple things to consider with the main question.
The first is the assumption that He doesn’t show Himself to all.
The second implicit assumption is that He would want to show Himself to all.
However, Scripture indicates that this is not what He wants to do. “You have seen and believed, but I say to you, blessed are those who have not seen and yet believed”.
Further, Scripture and Church seem to indicate that someone cooperating with God’s Graces with an open heart and searching diligently with proper reason will find Him. Nature declares the Glory of God, and I think that includes the nature of our reality. Some believe that we have available to us a final conversion.
Of course, one must wonder what it means when it is asked, “reveal Himself”. Is that not our job as Christians?
But, who does God reveal Himself to in this world in a sense of vision? Either devout believers or those who would be searching, most of the time. Not just randomly, it would seem.