Yes, they now have very young talented players like Ansu Fati or Gavibut at the same time, they need experienced players to control the game.
yes, Piqué and Busquets are experienced but they have left their golden times way behind in the past. So I think they should take time and should carefully buy each player as money is also a problem for them.
they still have a pretty good potential for the future of barcelona because their performance is quite good and even they are very reliable.
but as you said apart from taking time to process they also at least need an experienced mentor there.
busquet and pique are quite good but their era is fading I think and there must be more of them