The problem is that inclusive housing is expensive - if you build a inclusive space with parking or wheelchair accessibility or extra bedrooms, then you're silently excluding those who cannot afford those features. This was basically Hong Kong's government's rationale for why it didn't ban cage homes - doing so would benefit the winners of the public housing lottery but cause the "losers" to become homeless. Feels kind of like a trolley problem to me.

> Universal Design is a concept that proposes the creation of spaces with democratic use, guaranteeing egalitarian conditions in terms of quality of service. The main goal of Universal Design is to allow everyone to use them to the fullest extent possible without the need for adaptations. Considered a concept that applies to architecture and other areas such as product design, Universal Design serves people considering their characteristics, age and individual abilities.

Notably, the design website that you linked doesn't mention anything about making housing cheaper or more affordable.