Perhaps because of this...

(as well as the risk of myocarditis in young males under 30)....

-recent messaging has certainly been mixed and inconsistent.

....the decision is one to discuss with your doctor who can evaluate your specific risk/benefit situation.

Link: https://www.nbcnews.com/health/health-news/fda-advisory-group-rejects-covid-boosters-limits-high-risk-groups-rcna2074