Brasilia was not originally planned to have separate zoning, Lucio Costas's vision (Lucio Costa was one of the architects together with Niemeyer to design the city) was one of "superblocks", a block was supposed to be close to self-sufficiency (hence the enormous block sizes), each was to have housing, shops, schools and so on in the block or in neighbouring blocks. The military dictatorship of Brazil decided to revamp the plan and deploy stricter zoning, separating shops from residential areas which made the city a urban hell of traffic and commute.

Brasilia is also what I would call "not a city", it has a pretty large population which doesn't live in it like in a city. There's very few vibrant public places there, from an urbanist perspective it's a complete disaster.