Except that the USC job becomes open every 2-3 years
Let's take a look at the post-Pete Carroll head coaching hires by USC:
2010 - Hire Lane Kiffin, who lasted all of one year with the Raiders (4-12), and one year with the Volunteers (7-6). Going after Kiffin made sense, but he sucked at the two HC jobs he had prior to getting the USC job. His name meant a lot to them and he was a Pete disciple, but he clearly was in over his head and ridiculously young at 34 or so.
2013 - Hire Ed Orgeron as interim HC. His only HC gig before was at Ole Miss, where you guessed it, he sucked. Led them to their only winless (in conference) season in history and went a whopping 10-25 in three years. WTF were they thinking?
2014 - Hire Steve Sarkisian who was coming off a very, very pedestrian run at Washington, where he went 34-29. He's eventually fired for his behavior and substance abuse issues and goes 12-6. If anyone at USC did any due diligence on him, they would have found out about his alcohol issues since he had several incidents while coach at Washington.
2015-2021 - Promote Clay Helton from within as a 'safe' choice (also no HC experience) after the previous coaching hire disasters, and he does less with more going 46-24 with the one big Rose Bowl win; his recruiting classes were ranked (Rivals):
2010 - 1
2011 - 4
2012 - 8
2013 - 13
2014 - 10
*HIRED*
2015 - 1
2016 - 10
2017 - 6
2018 - 3
2019 - 18
2020 - 71 (the coach is toxic at this point)
2021 - 9
So, even with several disastrous coaching hires, the 2020 class is the only real outlier. Every other class is Top 20, and most are top ten. Pretty obvious USC being loyal to guys like Pat Haden and Lynn Swann didn't help either.