There are posters on this thread which obviously do not know how very expensive it is to have a child or adult who is disabled and needs help more than others.
An autistic child does not have the capacity for knowing/remembering, where they are 'at' at any time. You can 'train' - for want of a better word - a child to do simple things, but that takes patience and time, and involves paying someone to help the parents do just that.
I wish people would understand more about what 'care' means, whether in a residential situation or domiciliary care. One of the most important parts of care is being able to communicate, discuss things, according to the age and understanding of the client, of any age, from 0 to 90. Many, many people think that domiciliary care involves just physical help. It does not. Communication is paramount, yet that isn't even given in residential situations for all ages.
Autism is relatively new. That is because it was not recognised as being a disease. There are many disabilities like that. If autism was taken seriously, why is there such a high number on the waiting lists, and how is it t hat drug manufacturers cannot supply the drugs? Most of the answer is that the NHS is reluctant to make a diagnosis which will cost the country money. I think that is true even now, in the 21st century.
There are people who think that only the physically disabled need helpers. That is not true, and no matter that there is more understanding, wheelchair users are still what comes to mind when 'disability' comes up. I would be a very wealthy woman if I had a fiver for everyone who sees me on my feet, or walking and cannot understand why I need a wheelchair. The attitude is still prevalent among many people.
Take education, for example as where PIP/DLA is so necessary to the disabled child, whatever the disability. The school leaving age is 16. Students leave then regardless of how slow they are, even in cases of mental incapacity. If they could advance in their learning in an extra year just as students are studying for their A levels, their education stands a good chance of catching up, but there are few senior classes for them to stay on.
If DLA/PIP buys an extra year at school, then parents have no right NOT to claim for the child, even if they are 'comfortably off' because it is a child's right to education, even if they will not pass exams, and the child's RIGHT to enjoy a life made possible with extra help. Parents have a DUTY OF CARE (there is now an Act of Parliament) to make sure their children have every opportunity to education and welfare. Parents MUST NOT write off the child's rights by thinking they have enough money not to apply for non means tested benefits.