Some data suggest the Delta variant might cause more severe illness than previous variants in unvaccinated people. In two different studies from Canada and Scotland, patients infected with the Delta variant were more likely to be hospitalized than patients infected with Alpha or the original virus that causes COVID-19. Even so, the vast majority of hospitalization and death caused by COVID-19 are in unvaccinated people.
https://www.cdc.gov/coronavirus/2019-nc ... riant.html
seems like vaxed people still spread it but for a shorter amount of time. They say biggest concern is unvaxed. so either youre wrong about vaccinated being hit harder or the CDC is being contradicting them selves. Both options are probably true.