Measles and chickenpox are both respiratory and airborne. The serial interval is longer though, gives the vaccines more time to work to prevent transmission. Though, the chickenpox vaccine is more of a "parental time off work harm reduction" thing, however the newer shingles vaccines make that somewhat less so, as the combined vaccines do probably have a RRR on getting symptoms for your whole life.

Edit: not to say there's no "positive" effect on the total death rate (i.e. the vaccine causes there to be less deaths overall), it's just not a cost effective positive effect considered in isolation.