With #18797 we are making tags an optional requirement for third-party estimators. If there was a compelling reason to adopt tags, I would think that third-party developers would adopt it.

Currently, the tags are use to hold the metadata of an estimator. This is mostly use in our estimator checks.

One of the selling points is that the tags can replace the attributes we have in our estimators. We recently deprecated _pairwise attribute in #18143 . We are also working on deprecating _estimator_type in #17806. In this point of view, the tags provide a namespace for provided metadata in estimators, which can be used by other libraries that ingest estimators.

Are there any other reasons for third party developers to adopt tags?