Real Madrid are not used to forcing players of Arda Guler's age to play with the first team all season when they have more options of more qualified and experienced players. Real Madrid are certainly aware of Arda's wishes, but Ancelotti does not want to take big risks in many matches especially because they are always serious about winning them.
Arda is a player who has big ambitions to become an important player in the squad, but he needs more patience before he can be relied on in the main squad. Real Madrid might even loan him to another team next season to give him lots of playing minutes, which is what they usually do with other young players so they don't return to Real Madrid.
The president, Florentino Pérez is making detrimental plans for the club and executing projects that will develop the club, but he's not in his final phases yet. Real Madrid are focused on building an elite young team where the young players will served as key player for the club. Arda Güler will deliver in his early moments, he's uprising and promising player for the club. Carlo Ancelotti will slightly be giving him chance to play some minutes of tough matches, because building Arda Güler will take time but he quickly learns and few years from now, we will be watching him balling like Jude Bellingham.