I want everyone to know this isn't a meltdown but my general opinion.
Had you asked me if he was one of the great coaches after we had won the treble, I would have said the same thing I want to say now. He is okayish and nothing special. What made him acheve wonders was our top notch squad quality. If you go looking for coaches, it won't be tough at all to find his replacement.
He started with his own shit rotation ideologies as soon as he came here but soon rumors of his sacking came into light and all that transfer ban and anoeta saga hapenned and he reverted back to staying normal. Now after 2 seasons of a lot of titles he thinks he now has the freedom of trying out his methods because of the silverware he brought in the last 2 years and he has started his rotation thing again.
Teams do rotate, but managers like pep etc know how much to rotate,when to rotate,who to rotate etc. His rotations have absolutely no tactical meaning behind them and they all look like random lineups selected by picking chits of paper with player names. I wouldn't mind had we dropped points against RM or atletico but we lost 6 precious point and 6 are indeed precious in la liga to two really mediocre teams and that too with his shit mindset.
This loss is a blessing in disguise because after this, I think he will drop his shit approach.