Full offensive or full defensive strategies is not really important because Manchester United success get one points against Liverpool who more confidence easily defeating United on last match. Seems Liverpool losses three points against Manchester United not only with full defensive of Manchester United games play but also how bad finishing from Liverpool striker, they made 38 shots and have 8 shots of target with not really made Andre Onana have working hard to make many saves. Statistic match Liverpool more dominance than Manchester United have ball possession more than 69% depend with Liverpool have 31% but its not enough to help The Kop for defeating Manchester United as classic and rival match.
Achieving one point against Liverpool helped bit Manchester United keep close points to return to fourth standings, current position Manchester United remaining six points from Manchester City and have focus achieving three points upcoming match against West Ham United.
You are right, that is another fact but all are interrelated what I mean is Manchester United goalkeeper also plays an important role so we can't fully blame the Liverpool striker that's why I say interrelated. If this match is played at Manchester United home maybe the situation is different we can see more goals because Manchester will play a different style and strategy. Oh well I can't wait for the next Liverpool match the struggle for top 1 place against Arsenal of course we don't expect Liverpool to play like the last match, Arsenal as the leaders of the standings must be ashamed if playing with bus parking this is not just a struggle for points but there is pride there.