According to tiago forte, weekly habits happen frequently to be lynchpins in one’s life management system but not often enough to be natural habits like daily habits. This nature means they require more motivation and willpower to do. Thus, a weekly review can be challenging to establish and maintain.
References
Forte, T. (2017, May 27). The Weekly Review is an Operating System. Forte Labs. https://fortelabs.co/blog/the-weekly-review-is-an-operating-system/