[D] Why is Ordinal Regression so overlooked?

Ordinal Regression (Ordinal Classification) is such a prevalent problem in business and academia, e.g. ranking of products/risk/health/drugs, however there is very little out there in terms of papers and libraries.

The most recent and usable DL attempt I have found is the CORAL/CORN frameworks ([keras](https://github.com/ck37/coral-ordinal), [pytorch](https://github.com/Raschka-research-group/coral-cnn/)) which have just a few stars, and that's it.

Is it a problem that all big companies have "solved" internally, or is it just that no one bothers and it's approximated by clipping regular …

machinelearning ordinal regression