The thing about this debate is that it brings our so many people who feel they are qualified to dictate where other people should live but no-one is allowed to dictate to them where they live. They are usually where the 'poors' and the 'elderly' should live.
I am one of those people. Well screw you. Who are you to be telling me I shouldn't have a spare room and a craft room/study and the garden I have been tending for 20 years. It is bought and paid for by working for over an entire life (which was nothing like the stereotype you assume 'boomers' had).
Where I live is one of the few places where property remains reasonably affordable. However most of the housing stock isn't what people want so we need building. I appreciate that someone living in the South East might think that affording a two up, two down plus bathroom with a back yard and competitive on street parking is wonderful. But the price of living where you've decided to live. But if you can get on the ladder for not much more money with a downstairs loo, en suite and garden and drive why the hell wouldn't you. We need new houses and redevelopment of areas of old housing stock before it becomes derelict.
A whole pile of the existing housing stock isn't what people want. Why shouldn't we move on with what people think is acceptable. We don't live in rooms above livestock anymore, the world moves on.
But if think it appropriate to suggest others live with anything that wouldn't be acceptable to you, you need to have good talk with yourself.