Split from parent per @Tgr.
- Drop flagging features
- Drop having multiple tiers of review
- Drop tier3 (pristine) support – rEFLR41d295479e16: Drop tier3 (pristine) support
- Drop tier2 (quality) support – rEFLR04ffb5f56f23: Drop quality tier
- Clean-up now there's only one tier
- Drop having multiple dimensions of review ("tone", "style", etc.)
- Drop "tone" and "style" dimensions – rEFLRddb91cf8b29a: Drop depth and style from tag types
- Support only one dimension – rEFLR3fe0bacc5bb3: Support only one dimension
- Standardize the dimension name (the key in $wgFlaggedRevsTags) across all wikis
- Drop ability to have pages immune from review – rEFLR0fe4ed9a6842: Drop FlaggedRevsWhitelist option and just disable it on main page
- Drop ability to show the version of templates/files that the page used when reviewed – rEFLRe4ff4779203d: Drop FR_INCLUDES_FREEZE
- …
- Drop having multiple tiers of review
- Drop UX features
- Special pages:
- ProblemChanges – rEFLR8d8b3822d3ac: Drop ProblemChanges special page
- ReviewedPages – rEFLR7de102e939d5: Drop Special:ReviewedPages
- ReviewedVersions – rEFLR552aaf00394b: Drop Special:ReviewedVersions (and API equivalent, rEFLRdc93e33eb3a7: Drop ApiQueryReviewedpages)
- AdvancedReviewLog (aka QualityOversight) – rEFLR9aed5fdd91f1: Drop Special:AdvancedReviewLog (a.k.a. Special:QualityOversight)
- Drop ability to choose which user groups get shown unreviewed versions by default – rEFLR50ffcdf7ca93: Drop wgFlaggedRevsExceptions option
- Drop background image on non-low profile wikis when a page has a pending edit you're not seeing – rEFLR889ee09d2e91: Clean up two barely used frontend features
- Drop hidden message on non-simple UI wikis when viewing an old stable revision as a a reviewer – rEFLR889ee09d2e91: Clean up two barely used frontend features
- T285608: Stop logging and clean up auto review logs
- …
- Special pages:
- Drop extension hooks
- Drop FlaggedRevsFRGenericSubmitFormReady hook – rEFLRe894afbca50b: Drop FlaggedRevsFRGenericSubmitFormReady hook
- Drop FlaggedRevsRevisionReviewFormAfterDoSubmit Hook – I0d73aa07ad247ca37318ff0251a003484739a25c
- …
- Merge user rights
- Remove not user-facing methods and classes unused after the above removals