This is a tough one - the service fees are real, iirc I know of some people who have to pay £700 a month to the development which is more than enough to rent a small place outside of London. So I
can see an argument for segregation even if my personal hope would be for better harmonious living.
Though when some people have to buy a place for ~800k and other people get state assistance it's hard to see that working out well in either direction. One party feels like their hard work and effort has been undermined and the other party sees privilege and vast inequality.
I people who are "big" enough to drop that kind of money on a property and be ok living next door to someone in a similar plot who didn't.
But what is the solution? Hard to say, maybe tackle the root cause of wealth inequality - but how. I am neither politician nor economist...