Brasilia was designed exactly to not be what it became. The original plan from Lucio Costa introduced the concept of "superblocks" which would be more-or-less self-sufficient, having shops, residential apartments, schools, parks and so on every few superblocks.

The military dictatorship decide to introduce strict zoning (probably lifting ideas that were happening in the USA during the 60s), completely destroying the urbanistic approach of the original design.

It's a failure of micromanagement from authoritarianism, inspired by the misguided (and nowadays considered idiotic) approach to urban design of the USA in the 50s onward.