The issue with that approach is AFAIK with the costs (and environmental impact) of the transport.

While the pre-drilled holes tend to weight little, the "doughnut" (usually made in reinforced concrete) around them is really heavy, and then there is the problem of size, you cannot usually transport anything wider than 2.50 or 3.00 meters, but you have also limits in height (bridges cross the route are a problem) so you cannot physically transport more than (maybe) a 1/4 of a pre-drilled hole (with its outer concrete shell) with one truck.