The top two Spanish clubs sack every manager that doesn't bring them trophies end - of - season like I said. Barca are a bit less ruthless by not wielding the axe mid-season, but then again with the resources at their disposal the least they expect from any manager is the domestic or European title.
Pep is standing out from other recent barca managers because he outlasted them by winning more trophies. He chose to come to a more competitive league with opposition more suited to stopping passing football, that must be why it isn't such a breeze for him...