Kylian Mbappe's poor finishing this season is the reason why Real Madrid does not have high goal productivity. You are of course right that Mbappe had many opportunities in this match, but not only in that match, but in all matches Mbappe had many wasted opportunities. He has to be calm and stay away from pressure, so he needs to do it as well as possible so as not to become a player who will be ridiculed by his own fans.
Mbappe lower the expectation of people after signing people saw him to be a super player that will improve the performance of the club and with the help of mbappe Vinicius wss suppose to win all there games because they look like a match but even Vinicius performance have dropped this season and if not now that they are getting back on there feet because the conditions of Madrid was actually worse and it made people almost losing hope in them. And the issue of him wasting opportunity is actually very true but the mistake have been made I won't lie the advice of getting mbappe was a good one but they are not getting results.
And the season will soon come to an end and at the end of the day Barcelona might win if they continue to maintain consistency thay is what Madrid is lacking and they don't have a choice than to improve because of how the expectations of people is been reduced to nothing just because of how they have been failing, if they don't win anything they might do a come back next season which is not certain is just speculation since this season looks rough for them.