Ancelotti and Xavi saved their players energy for more important matches, the Champions League quarter-final match and the El Clasico match. Apart from that, the two coaches definitely don't want undesirable things to happen, such as player injuries, that could ruin their plans for these two important matches.
For the Champions League quarter-final match, I think Barcelona was a little luckier than Madrid, where Xavi fleet managed to win in the first leg. Meanwhile, Los Blancos were held to a draw in the first leg by City. Barcelona's journey to qualify for the semi finals looks easier, but it does not rule out the possibility that PSG can turn things around.
Madrid recent victory over Mallorca can increase players confidence, as can Barcelona victory over Cadiz. Los Blancos, who currently lead the La Liga standings by 8 points, can shift their focus completely to the Champions League, before having to face another tough match called El Clasico.
That was the right reason, especially since Barcelona and Real Madrid didn't meet strong opponents, so the coach made several player rotations and it proved to be quite good even though both teams won by narrow scores.
For the La Liga competition, I think everything is over and now the two teams will only focus on the Champions League stage and regarding the El Clasico match next week, it is a prestigious match between the two teams. The result I don't think will have a big impact on Real Madrid who are at the top of the standings at the moment. Currently, the possibility of Real Madrid winning the La Liga title this season is very large.
In the Champions League quarter-finals, it was a little easier for Barceona to look at the second leg because they had already won the first leg and also in the second leg they would play at home, of course that was a big advantage.
This is different from Real Madrid, which has to compete at Manchester City headquarters, which will be quite difficult.