The article identifies novelty and avoidance as separate drivers, but they're one mechanism viewed from two angles. The productive side tasks aren't just novel. They're safe. They generate evidence of competence without risking a verdict on the thing that actually matters.

The temporal discounting data is the most interesting part because it reveals something the article doesn't quite name: the older a task gets, the more it shifts from "work I'm choosing to do" to "work I should have already done." That transforms its emotional signature from opportunity to obligation, and obligations trigger avoidance regardless of whether you enjoy the underlying work.

The Zeigarnik point works against its own framing too. Multiple productive side projects create multiple open loops, all competing for the same working memory as the main task. The "productive" procrastination isn't just avoiding the main task. It's actively fragmenting the attention budget that the main task needs.