There are several "rare" side effects with Pfizer, too....downplayed.
Interesting that the FDA announced this restriction soon after researchers published a study that shows the J&J vaccine gives far better protection against all the new strains of covid so far.
The J&J vaccine does not use mRNA, but instead contains a harmless, inactivated cold virus to activate your body's immune response. That's why it works on the new strains. Plus it had the highest effectiveness rating (85%) of all covid vaccines.
J&J got a bum rap.