And I agree with you to a point. To find the remains of biblical archeological sites lends credibility for those who doubt. To find a chalice or piece of wood the origin of which will always be arguable is of limited value. The Shroud of Turin is an example.
God spoke through a burning bush and a donkey. I tend not to limit how he gets someones attention. If it only changes one mind, the angels will rejoice with the Shepherd.