I've never personally used meth (willingly, I'm sure some was in my rolls), however I can see way more actual benefit than even opiates, and opiates are my weak spot! Aside from actual pain relief or pure recreation, they are useless especially for motivation and depression IME. I've made the mistake so many times taking opiates thinking "I'll feel really good and then will have the motivation to do activities A, B and C" and it turns out they ROB me of any motivation I had. I need not explain why they don't actually help with depression either, opiates have never pulled me out of a depressive mood, they only have made me give a few less fucks about it. Even kratom does a far better job of providing a genuine mood-lift.
A good, euphoric stimulant though, I could see resulting in the motivation and productivity I was looking for, while also being recreational. I would be a music-writing machine! I've been diagnosed with ADD, SAD and GAD, all of which kill my motivation and ability to focus on tasks. I definitely have the symptoms but have not been medicated for them as I simply am very against SSRI's and don't want to take amphetamine regularly. I know that meth would probably cure all these issues I've been spending my life battling in one quick hit, and I know my addictive tendencies, which is why I steer very, very clear from it.
There is a part of me, though, that still is interested in using it for creative purposes every once in a very long while, but I still worry about the whole thought process of "I could be so much more productive right now if...........".