I think there should be more aesthetic philosophies. The lack of them, and of attention to aesthetics in philosophy generally, leads to an over-reliance of a shallow understanding of https://en.m.wikipedia.org/wiki/Wabi-sabi in particular, in my experience.
https://en.m.wikipedia.org/wiki/Arts_and_Crafts_movement which we could do with more like. The manifestos of art movements started by the Vorticists and taken up by art groups ever since, have rung increasingly hollow as their focus' narrowed away from rethinking our ways of life to only the design slogans for decorative fripperies.
Religious movements have a long history of implimenting philosophy in architecture, like the Hindu
https://en.m.wikipedia.org/wiki/Sri_Yantra This is arguably an example of a mandala, spiritual diagrams that are also microcosms, illustrating the whole universe or some part of it, and often including temple walls, so unsurprisingly temples are often designed around these. Sikh temples have inverted lotus flower shaped domes, representing the pure growing from the impure. Abrahamic religions seem to tend to be less philosophical in their architecture, although they do build in spiritual symbols (perhaps they just have simpler symbols).
This article is a bit of a rant against modern architectural trends but I heartily recommend it:
https://www.currentaffairs.org/2017/10/why-you-hate-contemporary-architecture Just as theatre, art, music etc now have a full palette again, with not just modernist and post modern elements, but also the option of symmetry harmony and speaking to tradition, so surely architecture. Personally I think we badly need more turrets with turrets on..
In terms of architectural-philosophers, a special class of thinker that expressed their thought in buildings themselves, I feel three stand out.
Gaudi, who you will know, used many natural forms like catenary arches which appeal to our biophilia.
Hundertwasser https://en.m.wikipedia.org/wiki/Friedensreich_Hundertwasser demanded more decoration and playful elements, and the integration of trees with his buildings.
Cesar Manrique https://en.wikipedia.org/wiki/César_Manrique defined the visual identity of Lanzarote, one of the Spanish Canary Islands. His buildings integrated with, responded to, and were built using, elements of their surroundings.
There are interesting commonalities between the 3. They didn't train as architects, Gaudi was a copper smith, the other two artists. They built some of if not the most popular things to see in their places of work, Barcelona, Vienna, and Lanzarote respectively. And last and saddest, after them no one took up their ideas, and if anything did the opposite in those places, building the same disposable cubes as everywhere else.
Architecture shapes our world, not just human interaction but also what wildlife thrive - we have chosen to build for pigeons, rats and cockroaches, above all others. Imagine if we built instead for parakeets, otters and dragonflies. Orchids high on buildings instead of buddleia. We have unparalleled power to choose, and we are sleep-walking.