This will be an unpopular take here, because I know Sampson is widely despised by the fanatics, but I think his overall take is pretty reasonable... He just, notoriously, delivers it in the most boring, milk toast way, that is completely unappealing to the emotionally charged segment of the fan base.
That opinion goes something like this...
"Notre Dame had only itself to blame for missing the playoffs, because they opened the season with back-to-back losses. A 12-0 or 11-1 Notre Dame is in every year time, but that second loss leaves Notre Dame vulnerable, without both confetence and ESPN backing, to fight for them in the committee room and through back channel pressure. This year it was made worse by the fact that the two teams Notre Dame was in competition with for the last spot were a team (Miami) carrying to flag of an ESPN conference, with the same record and a head-to-head win and an SEC darling (Alabama) living off the memory of Nick Saban and bolstered by ESPN investment in the SEC.
If Notre Dame doesn't want to join a conference and "play ball" with the rest of the sport, that's fine, but they then SHOULD expect to be the team that gets the short end of the stick when they don't control the controllables (ensuring they go 11-1 or better) because nobody is going to have their back. ND fans and analysts can make record, resume and competition based arguments all they want, but it's futile because that's not what got them left out. It was their independence and the collusion against them by those that don't share their values."
Sampson simply thinks that a lot of Notre Dame fans are naive to the realities of the business surrounding the sport and that their arguments about why ND shouldn't have been left out are futile and useless relative to the reasons why they were... In short, win 11 games, or more, and don't give the committee and ESPN a reasonable chance to screw you, because if you leave that window open, they'll climb right through.