Figured I'd also comment it here since it has some useful resources that led me to get diagnosed and improve my life :)
But the comment was probably meant to highlight that there's a sense of ambiguity in medicating what's likely a natural individual difference in brain chemistry. Many diagnosed with ADHD would be considered perfectly well-functioning in a society where hunting, defense or other stressful, spontaneous physically and psychologically demanding activities were common. Many of them would excel at it far beyond the ideal office worker.
So in that sense it can be considered a critique of contemporary society's requirements and standards.
I tried for a decade to make myself work "naturally". Almost left to be a monastic forever. At some point you have to pick up the same shovel everyone else is holding.
Unless you want to pay me 100k to keep trying to do my own thing.
First, I doubt there is any historical evidence of such a phenomenon.
Second, ADHD isn't nearly as prevalent enough in the general population to suggest that it's society.
If you have ADHD, doing what OP is doing is not going to be easy untreated.
Pharmacologically it's a different story - methanol is not a safe substance with any dose.
I'm not suddenly working 40+ hours always in the zone. What has happened is that I've been better able to enjoy/engage with coworkers around helping them. Instead of feeling stuck and anxious, it's been easier to feel at ease at work and less fixated on metrics or usefulness. That engagement with my coworkers coupled with lowering how much effort was needed to do work that was previously seen as "busy" work has done wonders for my outlook about work.
In my case the benefit/problem of hyperfixation due to ADHD meant that when I had an interesting bit of work in front of me I could knock it out the park and it didn't feel like any effort. Those infrequent home runs were enough to make up for the times where I just couldn't be bothered to do other less interesting things. Didn't want to do them and because no one was asking me to do them it was ok that I didn't. Deep down I knew I was overcompensating in my strong areas to avoid the uninteresting items. This may not be you but if it is you may want to think on it. It's helped me outside of work as well. Parenting and dating.