When playing games with new players, the phrase beginner’s luck is often coined when they do well unexpectedly against more experienced players. In board games and sports this is often indeed a case of luck or unexpected discovery of a skilled person, however in computer and video games this can be a programmed element to make the new player feel more confident.
It can be part of a leveling up progression in both skills and knowledge needed and empathy for the stress/excitement that comes with starting a new experience. The psychology behind it is to enforce the desired behavior and to encourage participation of your new starter.