They’re a controlled drug for a reason, abusing them can have negative long term effects especially if you don’t need them.
Yes–startups require energy, but stimulants are prescribed to those who need executive functioning support, not energy.
Anecdotally, as someone with ADHD as diagnosed by a psychiatrist who specializes in the area, taking Vyvanse makes me feel calm. I have seen people taking ADHD meds for exams/assignments become completely wired as a result of taking the drugs. YMMV and all that.
[1] https://www.additudemag.com/prescription-stimulants-methylph...
With full knowledge of what could happen (because effects are often not uniform), and with the right care and support I would think it can be done ethically.
Look at the trials of using LSD/mushrooms/MDMA to help people work through serious trauma. Done well it looks to be positively life changing, done poorly and it seems to be horrifying.