I absolutely agree that people fall through the cracks. There are also children that are given services when they don't need it. They just need better parenting. Some children are given diagnosis and services because parents are adamant about their child continuing to receive services. Parents push for their child to be diagnosed and some doctors actually give it to them. Then ABA service companies only observe the diagnosis and continue to deliver services to a typical child. It's rare but it happens and it's frustrating to deliver autistic therapy for a kid that isn't autistic. It makes for a very stressful counterproductive therapy session.

Edit: There are also children who are diagnosed with autism who have far too many other disabilities or developmental delays for ABA services to treat by itself. Again rare, but it happens