No, it isn’t a solution. That is a huge simplification and misunderstanding of how disability can presents. Such placements have multiple professionals working as part of the MDT. Are you a teacher, TA/LSA, SALT, OT, EP, physio, CP, ToD, QTVI, nurse… all rolled into one? If not, why do you expect others to be? And are you prepared for the increased cost to the state when parents reach carer burnout?
Residential school/college placements are only funded where they are required. If living at home with a day placement was suitable, a residential placement wouldn’t be funded.
Just because someone will never be independent doesn’t mean such a placement isn’t required and it doesn’t mean it doesn’t save money in the longer term. For example, the right support as a CYP can be the difference between:
Needing 1:1 or 2:1 (or even 3:1 or 4:1) as an adult.
A residential placement being needed or a placement within the community.
An ordinary residential placement or a secure placement.
Someone needing prolonged hospital stays in the future or not.
24/7 care or only care for some of the time.
Contact with the justice system and not.
Being eligible for CHC funding or not.
Besides, if you limit education spending, for many you will increase social care and health care spending.
If you specifically limit independent placements, you will increase spending on EOTAS/EOTIS/C. EOTAS/EOTIS/C is the easy or cheap option.