Earlier this season we played Wolves away 12.30 Saturday after playing Dortmund the previous Wednesday night so I don't know where you've heard that?
I don't recall Pep moaning but when he does make his views known regarding fixture scheduling he's not as whiny as Arteta.
A consequence of being successful is fixture congestion and if Arteta does make a success of it I'm sure it won't be the last time we hear him whinging as as we've realised he likes a good moan.
Just re read what Arteta said, think the rule is if you are away from home in a Champions League game you won't be picked for the early kick off Saturday, and he wants that modified to include if you are playing any game Wednesday you won't be picked for the early kick off Saturday.
As an aside from that, I totally agree with you. You need to suck that up, and build your squad to deal with that. I speak as a Rangers fan who's team was forced to play 5 games in 10 days at the end of the 2008 season, 1 a European final and 1 a domestic cup final in around the end of season league run in. Now that's fixture congestion.