If I was a government party with subpoena power I'd be really interested in the email chain around that decision.
(My impression is that the feature is hidden behind a setting because it's half-baked and not yet ready to replace opensearchdescription xml, add-ons, and bookmark keywords as the official way to add search engines.)
For those with tech knowledge who want to try to change things, I recommend checking out https://www.techcongress.io/, https://horizonpublicservice.org/ (they both have a cohort they're recruiting for right now) and USDS.