Both those drugs are also known to suppress appetite in many people - to the point that some used them solely as appetite suppressants.

They also do have significant risk of side effects (not trying to say anything about their used for ADHD which is well proven). Probably not a great idea to be prescribing tons of stimulants to people who don't need them (especially because these are drugs which are in large shortage often)

Since we are taking about ADHD, these drugs also help with executive function and impulsivity. Even without their appetite suppression effects, they might help ADHD sufferers stay on task with losing excess weight.