I feel bad giving our employees „fillers“ when there is no important work to be done. I feel like a dirty capitalist exploiting the fact that we have a contrac

I feel bad giving our employees „fillers“ when there is no important work to be done. I feel like a dirty capitalist exploiting the fact that we have a contract of employment with this person and I can legally command what he will do in his next 30 minutes (and I‘m fairly conservative otherwise, mind you). I rather wait until there is meaningful stuff to do. Of course at some point „hey we have a few days of no urgent tasks. how about we try to improve our test coverage a bit?“ becomes a completely reasonable thing and I believe/hope that the employee will agree and be motivated since he knows that he I value his time even though I am paying for it and don‘t give him fillers. But things like „ok wow that was quick! well umm, lets check the issues list...oh yeah! since you have 26 minutes left, could you fix that one misaligned pixel please?“ make me cringe.