You are going to spend a limited amount of time reading. Reading fluff novels has an opportunity cost of reading dense and difficult material.
If eschewing the fluff will reduce your enjoyment of reading and thus reduce the amount of time you spend reading difficult material, you should read some fluff.
On the other hand, if you carry groceries, that’s unlikely to prevent you from doing more pushups.
You are going to spend a limited amount of time reading. Reading fluff novels has an opportunity cost of reading dense and difficult material.
If eschewing the fluff will reduce your enjoyment of reading and thus reduce the amount of time you spend reading difficult material, you should read some fluff.
On the other hand, if you carry groceries, that’s unlikely to prevent you from doing more pushups.