I have worked in housing and homelessness for over a decade. I have seen many 16 and 17 year olds that have become homeless and end up street homeless, sofa surfing , living in young persons supported accommodation. All of these young people start out with disadvantage as soon as they hit this situation, for some things come right but for many it leads to years or a life time of continued periods of homelessness and sometimes becoming entrenched homeless. On top of this they are more likely to face things such as mental and physical health difficulties, exploitation and abuse, lack of opportunities generally and overall are more vulnerable. 
Many of these young people will initially be classed as a child in need with social services but this is often closed when they are “ suitably housed “ 

I want all 16 and 17 year olds to have child in need status with a designated social worker or children’s services personal adviser at least until they reach 18  , regardless of if they are classed as been suitably  housed when this is away from the family home. 
I see too many young people hit our 18 plus supported accommodation with the charity I work for, time and time again we are faced with young people that have slipped through the net as children and if they had had the right support as children their futures could be better.