I agree with this, they were right to sack Sarri because neither results nor performances were really up to standard but putting Pirlo in his place will only make things worse.
I don't know why more and more players are given chances so early on - imagine Gerrard getting the Liverpool job now. It should not work like that, these players might be good managers in the future but putting them in top seats too early is basically killing their careers before they started.
That is because everybody is hopping to pull out a "Zidane" and get few Champions Leagues trophies quickly without long term project. Zidane is one of a kind and he was a perfect fit for that Real squad. Big stars who knew everything about the football and needed a manager who will just let them play and bring out the best in them. His best results were on player psychology and he would have probably failed in most of other clubs.