I'm normally on a very minimal dose. I have, prior to getting timer tops and forgetting that I'd already taken med, taken >100mg of dextroamphetamine without feeling high and without titrating up. Instead, I got very focused and methodical to an uncomfortable degree, but there's absolutely zero high or euphoria.

Across ~4 doctors (1 PCP, 3 pysch), none have titrated up. They've ballparked and said things like "let me know and we'll reduce if you can't sleep and increase if it doesn't work. If you want, try doubling up or cut it in half (for non-XR)".

Given the variation in dosage visible in the literature (such as this case report of megadosing: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3407707/ ) I'd suggest that there are multiple underlying physical causes for the condition described as ADHD to the extent that sweeping statements like that aren't accurate. E.g. my (very different) experience and your experience being different indicates that we probably have different underlying causes, not that one is a myth or misperception and the other is the real take.