I just don’t really understand why fans pay attention to them
1) If you don’t have much turnover in your program and sign a small class you are dinged for it
2) Many coaches are saving scholarships for the transfer portal. Transfers aren’t included in recruiting rankings.
3) They complete ignore roster needs and positional value.
4) The first three points don’t apply to Alabama, Ohio St, and Clemson since they don’t really need to recruit.
Fans want to know who they are recruiting and how they stack up.
I know the value of recruiting rankings is debated back and forth. My belief is that, simply put, the best teams recruit at the highest level and this is almost without fail. Very, very few teams that have made the CFB Playoff have anything but Top 10 classes. Of the 28 team that have played in the playoff, only 2 (2015 Washington and 2016 Michigan State) have been teams that don't recruit at the highest level. So it is possible to win big without elite classes, but very unlikely. This has always been true, in another thread Nebraska's recruiting rankings under TO were listed and guess what consistent Top 10 classes. And our very best players, often 5-star dudes.
Having said that, I think that is where the predictive value of recruiting rankings end, with top end talent. The gap between those kids and the teams full of those kids and everyone else is huge. The gap between the rest is not. After those top guys, the difference in talent gets very small and the difference between the classes gets small. It might seem like we recruit circles around a program like Iowa, when we have a class ranked 20th and they have one ranked 40th, but those two classes are most likely much closer than a team with the 8th ranked class and Nebraska at 20th. That is why we see the same kids and same teams at the top of the rankings and huge differences in the middle, from service to service.