The connections in autistic brains are idiosyncratic and individualized

Each autistics' brain is distinct; non-autistics' brains are remarkably uniform.

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An intriguing possibility is that, because neural connections are shaped by the routine behaviors and experiences that we have every day, people with ASD each exhibit idiosyncratic connectivity patterns in their brains because they each experience the world and interact with their environment in an idiosyncratic way. Their idiosyncratic behaviors prevent them from engaging in the typical interactions that create typical brain scans.

I feel like this is probably the case, and because autistics have less experience in social behavior, its very likely that such connections that strengthen in response to it would be weaker.

Perhaps this could be used a measure of success for therapies though? If we can strengthen those connections, doesn't it seem likely that symptoms of autism would be lessened?

There's also the possibility that idiosyncratic brains are the 'normal' baseline, and that 'neurotypical' brains have a series of adaptions that allow them to or make them conform. If the altered brains became dominant, then they become considered normal, and thus abnormal is defined by the lack of those adaptations. This would be similar to how 'lactose intolerant' is considered abnormal in the West despite not being able to process lactose as an adult being the norm by far in mammals and by a pretty decent margin even in humans.