Bhagavad Gita, Chapter 18, Verse 10

The relinquisher endued with Sattva and a steady understanding and with his doubts dispelled, hates not a disagreeable work nor is attached to an agreeable one.

Real evenness is described here toward the work itself, not chasing what's pleasant or dodging what isn't.

This kind of renunciation doesn't show up as picking and choosing tasks, it shows up as genuine indifference to which task comes next. Real steadiness, not selective effort, is the actual mark.