
"In Architecture as Metaphor, Karatani detects a recurrent "will to architecture" that he argues is the foundation of all Western thinking, traversing architecture, philosophy, literature, linguistics, city planning, anthropology, political economics, psychoanalysis, and mathematics. In the three parts of the book, he analyzes the complex bonds between construction and deconstruction, thereby pointing to an alternative model of "secular criticism," but in the domain of philosophy rather than literary or cultural criticism." "As Karatani claims in his introduction, because the will to architecture is practically nonexistent in Japan, he must first assume a dual role: one that affirms the architectonic (by scrutinizing the suppressed function of form) and one that pushes formalism to its collapse (by invoking Kurt Godel's incompleteness theorem). His subsequent discussions trace a path through the work of Christopher Alexander, Jane Jacobs, Gilles Deleuze, and others. Finally, amidst the drive that motivates all formalization, he confronts an unbridgeable gap, an uncontrollable event encountered in the exchange with the other; thus his speculation turns toward global capital movement. While in the present volume he mainly analyzes familiar Western texts, it is precisely for this reason that his voice discloses a distance that will add a new dimension to our English-language discourse."--Jacket.
They instead focused on architectural 'theory', which meant anything from phenomenological approaches to space (Gaston Bachelard), to 'Architecture as Metaphor' (see book with same title by Kojin_Karatani, a critical theorist), hell, even theory-fiction (Benjamin H. Bratton).
A whole generation (or two, three?) of theorists have spent lots of time intellectualizing and philosophizing what, for a long time, seemed to be a design-oriented, practical discipline.
I wish I had sources for this -- it's only through informal conversations with practicing architects and theorists that I learned these things.