A response to Dame Uta Frith on autism, diagnosis, and the limits of the spectrum. Dame Uta Frith’s claim that the autism spectrum is “close to collapse” reflects a real tension in modern diagnosis. This article argues that the issue is not over-inclusion, but diagnostic flattening following the DSM-5 consolidation of distinct profiles into a single category. Drawing on a broader series of work, it reframes the problem as structural, shaped by simplification, usefulness, and misalignment between cognitive diversity and fixed systems.