If anyone wants to look at a computer algorithm that is probably as unbiased as any of the well know ranking algorithms, go to
http://www.colleyrankings.com/currank.html
I don't remember all of the specifics, but back in the BCS days, I looked into many of the computer models used. The Colley Matrix is (or at least used to be) unbiased in the sense that all teams start as equals. As the season progresses, when you beat teams, you acquire some of their strength, so beating a strong team gives you a larger bump than beating a weak team, and losing to a strong team isn't as penal as losing to a weak team. Every week, the entire matrix needs to be recalculated, because past results are influenced by the current week's play. Very logical.
Looking at the Colley Matrix, I have no problem with the top 8 teams being in a playoff. I think every team in Colley's top 8 has a more than trivial chance of winning 3 games against the others. I suspect, and this could be easily remedied, if true, that the teams with 13 games are getting an unfair bump/ding from their championship game wins/losses when compared to the teams with only 12 games.
To be perfectly honest, I'd be in favor of bumping the field to 8 and replacing the committee with something like an enhanced Colley. That would be a much more fair, logical, transparent and scientifically sound system.