Honestly, Chelsea's game during the match could change at any time, because there might be changes and most of Chelsea's players are at the youngest age if you look closely. And that makes the team's performance increase and makes it very powerful in the middle of the match and at the end of the match. which has shown the stability of playing with young players, of course that is the right decision in facing the match next season.
If that were the sole reason, it might not be entirely accurate, as any young player with less experience can't maintain consistency, as they generally face much greater pressure when facing a much stronger team. The Club World Cup certainly looked more convincing after Chelsea's progress to the final, and this provides a glimpse into how they will prepare for next season.
From the start of the competition to the final, Chelsea generally didn't face much stronger teams, making their run to the final easier. The challenge might be against PSG, as it will be much more difficult for Chelsea to beat a team currently in top form.