Explicitly favoring recent checkout counts over the other criteria is a bias. This is almost a tautology. Choosing based on criteria you favor rather than equa

Explicitly favoring recent checkout counts over the other criteria is a bias. This is almost a tautology. Choosing based on criteria you favor rather than equally valid or possibly more valid criteria others favor is a bias. It does not matter if you encode that bias verbally, in print, or in software. A bias is a bias is a bias.