I know the Vulcan Centaur is probably going to be quite an un-impactful rocket given what SpaceX is doing (while the upper stage is sort of surprisingly capable!), it's still remarkable with how little fuss and apparent lack of difficulty it was developed, being all-new with no components reused except the RL-10 upper stage engine (which is of new version, too). Seems like the curse of ever increasing complexity, cost, and development timeline for each new subsequent rocket family has finally been broken across the industry, not just by SpaceX.