Although it would be really interesting to literally send a letter to the error, I am instead writing this as a reply to my blogging friend Error. Upon a discussion held at that post.
When the government started planning for the new city back in the 50s and 60s, the applied theory was based on zoning and decentralizing. This approach made the result of a fragmented community, and thus disturbed the natural collaboration of profession. I agree with you about blaming the government in the way they assign jobs to the community as it needs to be really designed to make maximum use of skills, but I do think that we can give rebirth for a better standard of living on a scale wider than the government sector if we designed collaboration spatially. Yes there are attempts to bring many professions in one place, and there are examples of shared spaces, but the result is a "complex". A complex isn't a space that allows for conversion and diversion, but rather a random accumulation of different jobs, which with time ends up to be subject to zoning, producing terms such as residential complex, commercial street or mall, art district and industrial area.
Thus, what I'm trying to say is that since we're now contextually a fragmented city we need to identify and revive the different professions that every city should host, and then try to value and design our association.