The make up of a team behind a project is no doubt very necessary.
It is one of the parameters that helps the cryptocurrency communities to know if a project can fly and whether the ICO will sell.

When a project is not ready to reveal their team, coming to raise fund from the public becomes suspicious. They should as well raise their funds anonymously, since they laid that foundation in the first place.

For me; a project without a team is tending towards a scam as there is no one you can point to and say he is behind such project.