Also, what Aurora is totally missing right now, is the matter of the missing magnetic field exposing the colonists to deadly radiation and the low gravity slowly letting all the precious atmosphere escape into space. . .
The lack of need for a magnetic field can be (relatively) easily explained the the civilization being advanced enough develop cheap countermeasures, the same way lack of water on bodies is not an issue. I mean sure, water can be found almost everywhere, but there isn't enough of it on say Luna to support a billion or so people. I may have wished it was simulated (to a reasonable extent) but it usually doesn't bother me much.
The atmosphere loss however is not an issue, unless you're trying to colonize bodies with extremely low gravity (less than 0.05g) as it occurs over long periods of time. Mars needed millions of years to become the desolate place it is now and even Luna would be able to support atmosphere for thousand of years if my memory is correct. As games rarely last more than a hundred years atmosphere loss is not an issue.