1st is being more technically minded people tend to prefer and/or are able to move here.
2nd is being that the people here want fediverae to do well, so they try to be active by answering questions they would have just looked at and moved on on reddit (guilty)
Those are both fair points as people seem to just want to go with what they know as it's easier. I know I'm having a hard time getting my partner to move across to Lemmy from Reddit knowing she uses Reddit on a daily basis.