To expand a bit on my previous post and address this:
No group ever set out to become a 'standard' Civ.
Any attributes they developed that were similar to any 'standard' for the time and place were because they worked very well for that time and place (Flood Irrigation in the marshes of lower Mesopotamia or Egypt's Nile, for instance). And IF they developed a unique way of doing things, it was because they discovered or developed into something that worked better (for them) for that time and place.
So, in my Perfect 4X Historicalish Game (in development Forever, doubtless never to be published), Every Civ would be able to build Stepwells - but they would only make sense if your Civ had the same surroundings and conditions that the Maurya did, and would carry some possibly-unappreciated Side Effects you might not want or expect0 , because any Unique Anything is always shaped by the society and shapes that society, and the gamer should have to deal with that as well as the goodies that the Unique brings with it.
To re-purpose the old Quote:
TANSTAAFL = There Ain't No Such Thing As A Free Lunch.
- or a free Stepwell, or Legion, or Long (Great) Wall or any other special attribute, unit, or technique.