1. Limitations are the artists’ best friends, e.g., fixed city limits.
2. As in every perfect work of Architecture a true proportion will be found to reign between all the members which compose it, ..every assemblage of forms should be arranged on certain definite proportions; the whole and each particular member should be a multiple of some simple unit. Proposition 9 e.g., the surveyors six mile square township (created by architect Thomas Jefferson and adopted by the 1st or 2nd Congress) or a municipal unit of four townships which is about 100,000 acres; that would easily accommodate a city equal to the population of NYC. But remember in the principles of economics that the optimum size city is about 100,000; anything more is a luxury which we cannot always afford which is one reason big cities are bankrupt.
To pursue the question of where planning fits. City Planners are Architects in fact but I think we need to understand the difference is between building planners and city planners - building planners have a monopoly on the word, now; cooperation depends on understanding our proper role in the planning process - this is confused because it is identical, that is to coordinate the work of other professionals in the process of building cities. The conflict is from a lack of education and training on both sides. Let us examine what that is - that can be easily discerned by analysis. Architects have design skills by virtue of education and training in building design which also includes planning skills. Planners have planning skills but much greater knowledge of other professionals involved in the building of cities