Fair question. I mentioned this in another comment, but Learn to Rank allows a customized sorting order that is specified by an administrator. Where you see t

Fair question. I mentioned this in another comment, but Learn to Rank allows a customized sorting order that is specified by an administrator. Where you see this is in systems where you need a really fast evaluation (ms) and computation doesn't work well. For example, in an e-commerce system you might want search results that reflect what your users are likely to buy. For a few items you might be able to do something computationally with SQL, but at scale there are lots of features and signals and noise and it quickly moves past algebra. https://en.wikipedia.org/wiki/Learning_to_rank#:~:text=Learning%20to%20rank%20or%20machine,models%20for%20information%20retrieval%20systems https://en.wikipedia.org/wiki/Learning_to_rank#:~:text=Learn....