I know that the number 10 jersey is mostly worn by a prestigious player in a team but i don't get the idea of giving someone who already has a jersey number previously. I also learnt that Barcelona also gave Lamine Yamal the number 10 jersey, it's fine anyways but it's really unnecessary, after all world class players like Cristiano Ronaldo and the rest didn't wear the number 10 jersey but they were outstanding in their performance. Whichever way, i feel that Real Madrid wants to honor him with that number since Luka Modric who have been wearing the number 10 jersey for years won't be playing in the team anymore. I don't think there is any responsibility attached to wearing the number 10 shirt so he should just keep up with the energy, that's all.
In my opinion, the reason Real Madrid gave the number 10 to Mbappe was probably to signal that he is now the one holding the "torch" at Real Madrid, after the number was vacated by Luka Modrić. The number signifies hope, responsibility, and the potential to create miracles on the field, especially considering Real Madrid's poor performance last season, it is hoped that Mbappe can be more motivated to improve Real Madrid's performance. and I feel that Mbappe will not take this lightly, there will definitely be more responsibility that he will shoulder, and it is not an easy matter.
Yes, that's right. Jersey numbers in football are indeed very sacred because certain numbers carry the highest expectations for each team. However, if I'm not mistaken, when Arda arrived at Real Madrid, he was even touted as Modric's replacement, and many people thought the number 10 would be given to Arda. I also think Arda wanted the number 10, but the club decided to keep it for Mbappé.
Furthermore, if we look at Real Madrid's jersey numbers, players who typically wear the number 10 are often identified as midfielders. Mbappé is more suited to the number 9 or 7, as he's a forward, but now it's his and the club's choice. Hopefully, he can bring hope and glory to the team, as you mentioned.