I highly doubt that anyone really cares that much what ever anyone else wants to 'rationalize' as far as unit size, time scale, land dimentions...
It only matters (and even then not to everyone) when people want to effect changes in the game to accomodate some other rationalized view. For many aspects it's entirely inconsequential, for some it's detrimental to the game in some way (added complexity, added system requirements, ...) for others its such a matter of personal taste that its impossible to arrive at a consensus.
I don't get the feeling that anyone here is actually asking Illwinter to change the scope that they have built the game around, its more about resolving the incongruities in their own minds rather than trying to foist a new dynamic on everyone else. As to what 'epic' means... well that's going to differ for everyone, and everyone is going to have a different limit to which they can rationalize the inherent abstractions in the game. Its all good though, as others have said, if you like a game with good strategic depth you'll soon stop worring about the trees and start concentrating on the forest. If you can't (see the forest for the trees that is) then you'll gradually become frustrated and lose interest. Nothing wrong with that, just means Dominions isn't quite your cup of tea.
I dunno, I just find it funny (as in strange) that people need to validate their rationalizations, as if some consensus of forum dwellers saying 'yes it's 100per' or whatever should have any impact on an individuals ability to make the rationalization in the first place. Don't take that the wrong way, its not ment to be critical, just an observation that I see frequently in game forums, and it makes me wonder
I'd be curious though to see a mod where someone tried to change the scale as others have suggested. I don't think I'd use it as I think the added micro wouldn't be worth the bother, but I'd still be interested to see how it shook out.