I agree with you on your other comments...but, yes, we must get the ball rolling with a diagnosis if treatment is required. As to what constitutes "functional," that is a whole new area of discussion. Take stuttering, for example. A student might not qualify for special education services in some schools, because they are doing well academically, passing all tests, in all senses to an outside observer, "functioning." Yet many people who stutter, are not fully participating within the educational environment, hence perhaps educationally, not academically, impaired. These students may fall under the umbrella of Speech/Langauge support services as a designated student in special education, hence entitling them to the full range of services (if needed) that a student with academic impairments would receive. Some of these children won't volunteer in class, sometimes being marked down a bit in grades for non-participation, often having teachers who don't know that they stutter. The good thing in today's educational environment, is that we have teams who come together to discuss the performance across all areas so that students don't fall between the cracks as they did years ago.
So, functional, yes. Many are functioning but not, perhaps, to their potential. While schools need only offer a free and appropriate education (FAPE) not optimal, some functioning students can still benefit from some services to help them in certain areas, often in pragmatics of communication and/or in areas of social interaction.
I also have an advanced degree in Educational Administration and have worked for the New York State Education Department of Education, as one of six regional associates responsible for monitoring special education services to more than 120 school districts. We also assisted private schools and grandfathered in pre-school programs under the special education umbrella of the state + school system.
I loved both of my careers. They worked together. Over the years, I feel privileged to have been able to work with students and adults with such a diversity of needs. This is a great discussion on Asperger!
Sheldon and Bones are functioning in their work settings. Each has some difficulties, however, with personal relationships. Dear Sheldon really hasn't had (until this year, which I haven't seen yet) a relationship with a significant other. Bones is only now hooking up with Booth in a real relationship. Of course, some of the tension comes from the writers having to stretch out the shows over years. So, only now, is Bones in a committed relationship, which is presenting both of them with unique challenges given her ways of "functioning." I love it!