Whereas investments castings are certainly a boon, many of the old shops seem to have also purchased locks barrels and foundry parts, so the modern builder is not too terribly different in that respect. I think the largest difference is the information exchange, the availability of a multitude of parts, and the diversity of building styles . 100 years from now how many of our works will be able to be identified by a distinct style like a Beck or Dickert is today? Herschel's work, to be sure, but most of the rest build a variety of styles that probably could not be identified without a signature. Also the quality of work looks to be above that of the run of the mill smith of 200 years ago. They just didn't turn out the super guns that we see today. Not that they couldn't, but money was much more scarce and the demand just did not seem to be there.