1. The rise of Design-Build approach during recent decades.
2. The use of software models during design to minimize the need for changes during construction.
3. The availability of (paper) drawing to a contractor since they can now be easily printed as needed, using software (and each print is as high quality as the original). Much better than a contractor having to "guard" one clean, on-site print as a reference for reference when the "everyday" field copies get so beat-up, torn and dirty that they can barely be read.