It is always designed to a minimum. And that's fine.
And in Japan, 20m2 - luxury - which not everyone will be able to afford - will depend on many factors)))
And - the territories - for building free - are enough, so as not to be crowded, but the mentality is irreparable)
For the Dutch, when they do not have enough land for construction, they drain, fill, build floating islands, on which they put houses.
Venetians - so did.
And neither the Dutch, nor the Venetians - do not live with their families in apartments - very well-appointed - 12-20 m2)))

Do you like links - catch this off-topic (I haven’t been looking for a long time - something that came to hand) -
https://boom.ms/tipichnaya-yaponskaya-kvartira/
https://levik.blog/260959.html
https://varlamov.ru/2659044.html

The topic is interesting, but here is offtopic)))

Wedding. Photographer: - Young, well, look! Now the bird will fly! Bride (smiling at the lens) - to the groom: - Goat, you again, perhaps, did not fasten his fly?