To review:

geo_updates
geo_killist
wikiset
wb_changes
wb_changes_dispatch
wb_changes_subscription
wb_id_counters
wb_items_per_site
wb_property_info
wb_terms
wbc_entity_usage
wbqc_constraints
wbs_propertypairs
wbt_text
wbt_type
wbt_text_in_lang
wbt_term_in_lang
wbt_property_terms
wbt_item_terms

--------------
could be dumped, probably useful

flaggedimages
flaggedpage_config
flaggedpage_pending
flaggedpages
flaggedrevs
flaggedrevs_promote
flaggedrevs_statistics
flaggedrevs_stats
flaggedrevs_stats2
flaggedrevs_tracking
flaggedtemplates
--------------
obsolete or deprecated

ep_articles
ep_cas
ep_events
ep_instructors
ep_oas
ep_orgs
ep_revisions
ep_students
ep_users_per_course

--------------
may not be useful

global_group_permissions  -- CentralAuth related, doubtful there's a use case given we can't dump the user table
global_group_restrictions
global_user_groups
localuser

pagetriage_log           -- all of these are used for enwiki page triage only, a mirror might only care about new triage
pagetriage_page             Are they useful for crunching numbers for researchers? Unclear. Can't see a bot use case though.
pagetriage_page_tags
pagetriage_tags