Real Madrid rarely experiences financial problems which in turn has made them the dominant La Liga team for a long time. Their good finances and reputation for being proficient in bringing in expensive players means that Real Madrid really deserves to win more titles than any other La Liga team or European team. The total value of their main squad could be 2x or 5x more expensive than the total value of other teams such as Cadiz, Rayo Vallecano, Almeria and many others. So it is very natural why this team can dominate the domestic league even on the European stage.
Therefore, I have never been surprised at all by Real Madrid's approach to building their squad. They have 17 foreign players in their squad and are the second team with the most foreign players in La Liga after Sevilla. I wouldn't be at all surprised that Real Madrid could win the La Liga title in so many seasons, but would only be surprised if they were thwarted by their two closest rivals.
The best thing I have learned from Real Madrid is that they will buy players they believe will be top players in the future. Madrid is going to buy them at lower prices and then sell them at a higher price after their performance gets better. Also, I saw news, or rumors, that Brahim Diaz's market value increased from €40m to €65m due to his outstanding performance this season. Real Madrid is the best club with experience in producing players, if you look at the Real Madrid squad, you will not find a single player who is performing poorly. Real Madrid paid Fernabach €20m for Arda Güler. I believe that if Real Madrid sells this young talented player, they will earn 2x as much as they bought him.
I won't be surprised if Real Madrid continues to dominate La Liga for the next five years because they have the quality and ability to overtake any club in the league. I believe that Barcelona lacks experience because they always rely on their academy players and believe that they will build the team with their academy players, but Real Madrid did not just rely on their academy players, they spent a lot of money to buy young players from other places. In my opinion, that's why, they have never faced financial difficulties like Barcelona.