There are many problems with the idea that every community should be so maximally walkable that you don't need any other modes of transit. Some urban uses like parks require local low density in an urban setting and they can easily get large enough where 20min walking barely gets you across. Also the social network of people even just including the closest friends and family usually even in dense cities spreads out at least a few km. Also super tall buildings aren't actually particularly efficient. Also some services greatly benefit from a certain centrality that can never be in walkable reach for all people of large cities e.g. universities or other more specialised institutions. Transit and bikes are huge enablers for people to freely live their life as they see fit, and some level of global interconnectedness is probably needed forever. Build one efficient medical supplier, steel mill, semiconductor FAB or generally any larger factory and walkability is immediately gone just because these facilities need lots of space, and their entire supply chain would be much less (thermally/CO2/resource) efficient if we were to split theses factories to enable local production.
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