He is playing a system that requires fast wingers and Bernardo doesn't quite cut it, I think he has shown quality there for sure, but ultimately his qualities are far far more favourable in the midfield. Mahrez is also not exactly the best when stuck out wide, he likes to play inside a bit more.
Pep needs to let Sterling play more central and allows our fullbacks to attack the wide spaces more (where we no longer have enough quick wingers).
3-5-2 or 4-4-2 diamond would fix this imo. Still not understanding why we are asking our fullbacks to play like Zinchenko, he made sense as an inverted option, the other 4 do not.