[johndavi]

I formerly ran a large team and cared about both things for my employees: their productivity AND happiness.

Part of that is that I am a human, and part of that is practical -- namely, productivity is a long game (at least for knowledge-workers). It's not something you measure in work-units-per-hour within the confines of a single day. Same reason you can't have a death-march release cycle and ignore the plummeting "productivity" in the days/weeks/months after... or the lost productivity from employees who seek more manageable work elsewhere and need to be replaced, etc.

Your post is too one-sided and uses Adderall as a straw-man (or similarly fallacious argument). Your personal happiness as others have said isn't the only factor in an employer-employee relationship -- but that said, viewing productivity as a many-factored, nuanced thing that includes overall worker happiness (or, better put: satisfaction) is probably pretty appropriate.