https://blogs.fangraphs.com/looking-back-at-the-2022-zips-projections/
A perfectly timed fangraphs article. Anyone who wonders about projection systems, just go through the list of the biggest misses on the plus and minus side and you should notice a trend.
Generally, the largest misses on either side are due to breakouts, very limited data from the MLB and relying on minor league numbers, or falls off cliffs.