But it does exactly that. There have been enough studies about this. CBT and medication combined improved faster, but CBT alone catches up in a few months. E.g. https://journals.sagepub.com/doi/abs/10.1177/108705471667119... or this study here: https://pubmed.ncbi.nlm.nih.gov/31280035/
>Stimulants are the gold standard treatment.
I'm not arguing that they don't help, but CBT also increases other metrics, e.g. self esteem, acceptance, self-efficacy, and so on.