It would be really helpful if there were an in-game "Game Log" that you could open up in the UI to look back over important events/choices and what turns they happened on. Sort of a mix between gossip and timeline in previous games.
Stuff that would be helpful (or potentially helpful) to include on the Game Log (with turn # & year):
- wonders built or projects completed
- buildings completed
- celebrations started/ended (and choice)
- commanders recruited / fallen / respawned
- settlements captured
- city states suzerained, and bonus chosen
- narrative event names and choices picked (cost and benefit)
- legacy path milestones reached
- commander promotions/commendations granted
- (modern) ideologies chosen, artifacts researched on continents
- (exploration) settlements fully converted
- crisis events and choices
tangential benefit: could potentially be helpful for debugging purposes
Might also be helpful if there were a few filter options:
- show/hide certain players
- show/hide certain types of log entries
- currently active effects