Barcelona's main strength is that they are not dependent on any specific player. Yamal, Pedri, Lewa and Raphinha are all able to perform well in every match. That is why it is easy for Barcelona to perform well consistently.
Barcelona have multiple performers. More importantly, they have the youngest players in their core. Young players are less prone to injury and fatigue. That's why they don't look weak despite their busy schedules. The mastermind behind Barcelona's consistency is their coach Hansi Flick. His great planning and team management have made Barcelona unique this season. I don't know how much Barcelona will achieve this season, but I am very optimistic that they will go far this season.