I would like to propose that any feature flag whose name begins with "broken_" should be removed in the next major Mongoid version, in this case 8.0.

In every instance, the "broken_" feature flags are simple bug fixes that would probably be done in either tiny or minor versions without a feature flag in normal Semver.

If a feature is intended to be kept for the next major version, it should be marked as "legacy_" not "broken_" – legacy implies it is more a matter of opinion/preference ("the old way of doing things"), while "broken_" implies correct vs. incorrect.

(Rails provides a good model of managing feature flags and semver, I think most in the Ruby community are happy with how Rails handles things.)