I like years a lot better than turn numbers. Unless players actually count turns while they play, they are likely to be far more used to keeping track of progress based on year.
While I agree that event-based milestones can have problems on some types of maps (for example, milestones oriented around meeting civs off the home continent have no meaning on true pangeas), such problems could be solved by removing milestones that make no sense in a particular game. And on non-pangea maps, I think securing contact with and maps from all the other civs is definitely an important enough event to be worth a milestone. Not only is it relevant from a spoiler perspective, but contact with other civs is also important in that it sets the stage for future trade relationships.
One other thing: 1000 AD is not necessarily before the industrial era at all, much less a good point to break up action between 10 AD and the industrial era. Consider when I entered the industrial era in some of my games:
AU 401: 810 AD or earlier
AU 207: ~990 AD.
AU 204: ~910 AD
AU 203: ~770 AD (assuming Steam Power wasn't a free tech)
AU 202: ~850 AD
Now suppose I start talking about where I'm building my iron works in my 1000 AD DAR?
While I agree that event-based milestones can have problems on some types of maps (for example, milestones oriented around meeting civs off the home continent have no meaning on true pangeas), such problems could be solved by removing milestones that make no sense in a particular game. And on non-pangea maps, I think securing contact with and maps from all the other civs is definitely an important enough event to be worth a milestone. Not only is it relevant from a spoiler perspective, but contact with other civs is also important in that it sets the stage for future trade relationships.
One other thing: 1000 AD is not necessarily before the industrial era at all, much less a good point to break up action between 10 AD and the industrial era. Consider when I entered the industrial era in some of my games:
AU 401: 810 AD or earlier
AU 207: ~990 AD.
AU 204: ~910 AD
AU 203: ~770 AD (assuming Steam Power wasn't a free tech)
AU 202: ~850 AD
Now suppose I start talking about where I'm building my iron works in my 1000 AD DAR?
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