Okay, you seem to be saying why all those scripts are weak?
I've never found a map script that I didn't think was weak -- apart from those that I think are absolutely appalling
I was just trying to point to some of the peculiarities of the map scripts I mentioned for those who might never have encountered them before. To my mind, the map scripts are one of the worst aspects of Civ -- and the fact that there is a thread on this forum in which people make great efforts to produce decent maps to share kind of demonstrates how bad they are.
I've never played on a Terra map of any kind, so I don't know what the pitfalls are. I may try one just to find out.
Cheers.