Even if Pep is given a bigger squad, he will play at most 15 players who is seen being a regulars while the rest is just get barebones in cups or odds league appearances.
Pep will always manages the squad this way for many years and being very successful at it. i doubt he will start to changes for this season and couldn't careless how some fans think about it.
Remember he complain the lacks of substitution that can be used in single match in PL two years ago, yet when the new rules introduces to allow more substitution he still doing the same thing like he did before and not using his substition more often enough.
Which makes me think having bigger squad is useless when Pep will not playing all of them enough to rotate for season.