The day Housing Benefit arrived, should have been the last day council tenancies existed. The continuation of both systems creates constant anomaly and injustice, and perpetuates underuse of housing, inappropriate housing, and inability to freely move home according to need.
(8 years to 20 years is the increased average in time for people to remain in one place, which is unlikely to be because more people, council or private tenants or owner occupiers, have no wish or need to move)
The existence of 'social' housing perpetuates lazy assumptions that everyone happily gets a mortgage or a council tenancy, so that's nice. If a few random people won't do either, they can satisfy their weird need by going and getting a private tenancy. So that is a neat three alternative solution for every possible situation. Job done.
There is an arguable case to suggest that an entirely different way to secure a roof over one's head is needed, urgently. The national housing stock is, in the ugly terms of the n.h.s., 'bed-blocked'.
People can need more disabled-access, and want a private garden, and want to live near to a supportive contact, and need to be near a bus stop, and need to be able to afford the upkeep of their home and still have enough for both heating and eating. Over a certain age they won't get a mortgage and won't get a private rental, since all landlords are chasing the same 'perfect' couple of young high earners.
But they won't get a council place either, (as illustrated by the nationally publicised Bournemouth Bus Shelter couple) even if they are in their 90's and in wheelchairs, if they are guilty of still having virtually any private assets remaining (even if it's just enough to pay for a couple of decent funerals). The savings ban applies even to those without a single penny of private pension.
It also bars them from having the means tested addition to bring the lowest state pension up to the minimum income level deemed by the state necessary to sustain life. They must, literally, eat into their pathetic remaining precious resources. The life-savings-punishment also means if they did get a private tenancy, they wouldn't get a penny of Housing Benefit.
Meanwhile, a woman who is entitled to claim free school meals, housing benefit, a priority place on a council housing list, and any means tested benefits she chooses, can be quietly enjoying an entirely unlimited amount of added income, provided it is in the form of a private allowance from her ex, labelled as child maintenance.
Meanwhile, too, as other posters say, Mr. Crowe and some M.Ps can sit in council houses at artificially low rents for life.
Old, unexamined assumptions and old unexamined systems are by definition unlikely to remain logical for a century. Council tenancy security of tenure for life plus artificially low rent, versus precarious, disastrously scarce and therefore costly private rentals, with risk of being on the street at no fault, on 8 week's notice, is no sense.
Simply ignoring the existence of groups of people who cannot get a mortgage or a private or a council tenancy will not make them cease to exist or cease to need a roof over their heads. But all supposed 'homeless' effort is aimed at visible street sleepers, a tiny minority.