Once the rote greeting ceremony is over, some of those dogs will refuse to interact further in expected ways like playing with balls or tag or having any desire to actually BE with people. It is rare, but has been seen in unsocialized to people dogs. And when pressed to interact, that dog may bite.
Ask vets and groomers how often they get bitten by snuggly family pets... not as uncommon as you might think.
I'm not saying sighthounds are biters, they generally have a very low incidence and tend not to be dog aggressive, too. On the other hand, they are often very choosy when and who they snuggle with after they reach maturity and may prefer the adoring gaze from across the room and the head on the knee approach as compared to the jump in your lap and smother you with kisses, paw you and knock your glasses off in jubilation response you can get from some breeds.
All dogs need training. How and what direction that should take depends on native tendencies and the environment the dog will be in.