I think Liverpool's transfer step was more correct. It was necessary to strengthen the midfield to feed Nunez and they did it, they will. Mohammed Salah will feed him enough anyway. If he is a productive attacker in the midfield, it could be a great season for Nunez. If Klopp saw this potential in him, he could find more opportunities this year.
Some teams in the Premier League do have almost the same opportunity for next season as long as the team coach can take advantage of players who have talent in certain lines and I think not only Liverpool can do that, but there are several other great teams who can also do this as long as their players don't suffer injuries next season. Nunez and Mohammed Salah are pretty good players, but they still need to make Liverpool look stronger next season with a level of hard work that isn't easy.
Basically Nunez has a very good posture to duel in the opponent defense, and also when Nunez gets a pass of course Nunez can win it even if it is a cross. Therefore, it's no wonder Liverpool prioritize bringing in midfielders. Because it will keep Liverpool midfield good after being left by some of its senior players, such as Milner and several other midfielders who left in this transfer market. Because at least, if Liverpool midfield is solid, then it will make their attacks better and also strengthen their defense too of course.
You are right, Liverpool's midfield needs to be strengthened. A stronger midfield will improve the performance of their attacking players. Manchester City's performance last season was very consistent. The midfield of this team I think is the best midfield in the world right now. However, with Liverpool aiming for the title, their midfield and defense need to be strengthened. Liverpool failed to qualify for the Champions League. The team's sole aim in the coming season will be to perform well in the Premier League. And so the team has the highest chance of consistent performance in the Premier League.