Wrong. 1911's are neither easy nor cheap to make, at least by comparison to newer designs. That is the whole reason why so many new 1911s use cheap cast or MIM parts these days. The original specifications called for the parts to be machined from forged barstock, which is too cost-prohibitive these days. However, this is also the only right way to make durable parts if you really want a good, reliable 1911.
Example: No less than a dozen genuine USGI or early pre-war commercial 1911 pistols are in my collection, all still with their original plunger tubes, slide stops, extractors, sears, and disconnectors. At the same time, these five components are some of the most problematic ones in new pistols these days, mostly because they are usually cast or MIM. For example, I had to replace two plunger tubes and every extractor in several new Colts and Kimbers, and one Springfield I bought in the last three or four years.