He doesn't look like a tactical mastermind to me, whatever limitations the board and the locker room bring upon him. That said, it's silly to expect 32yo+ players to carry the team, even more so with a game every 3 days. And he should be able to explain this and make appropriate calls.
The right thing would have been to start a phase out period for these guys, a couple of years ago, by bringing younger guys who can gradually take minutes off of them. I really don't blame any of them for wanting to play. No player ever just stepped down on his own at 32.
We have no real backup for Suarez (braithwaite just arrived and is not eligible for CL) for years now.
We have no backup at all for Messi for years now. Dembele was to be it I guess, and that pretty much says it all.
We have no backup for Pique.
We have no backup for Busquets.
Our backup for Jordi is freaking Firpo, who just arrived this year and is not a great player.
Every player who we brough to play on the left wing has flopped worse than the previous one, leaving us with a 17yo as the best option.
Arthur who was supposed to be a future player for us, has regressed so much, to the point that a 20yo Puig makes him look insignificant (Although I have high hopes for Puig, he still is 20yo with no experience).
The carrying core of the team should be 23-29 yo, surrounded by a couple (at most) of our 32+ stars and some youngsters here and there.