It's not about scoring early but to also score more goals, because if they only score an early goal, Real Sociedad will equalize the goal like they did in the first leg. United should focus on scoring more goals and avoid any costly mistakes that will be an advantage to their opponents.
I also quite agree with what you said because from the first leg we can see the reference that scoring early is not the key to advancing to the next round if there are no more goals as a determinant to win the second leg. I also hope Manchester United can do that in today's match so that they can advance to the next round and compete again with their abilities this season. Because Manchester United no longer have hope to be in a better position in the EPL, so they only need to put greater hope in the Europa League this season as a form of their abilities so far.