Another issue here is an extremely narrowed definition of productivity. It has cog-like traits, Fordian belt work comes to mind. Yes, in this context you can become less productive for one reason or another. But all these micro-optimizations will also affect the mind in the long run in a much more profound way. More than anything its higher forms - even of productivity - especially these connected with creativity.

You cannot fight this with a clock watch the same way the vast majority of people cannot lose weight by simply dieting. For this, you need positive incentives. Not to be misunderstood, sometimes you have simply to grit your teeth.