Thalassicus
Bytes and Nibblers
I've had wide/conquest games without any national wonders, and world wonders are themselves difficult to get on high difficulty levels. Pangaea is one of the two map types I support with this mod and there's plenty of those games with few coastal cities. I've played culture games with no conquest. Most policies are useful only if we do certain things. 
The changes to harbors/seaport in the past few months are:

The Harbor and seaport nerfs really hurt!
The changes to harbors/seaport in the past few months are:
- Harbors give +1
on sea resources (was +1
on water tiles).
- 2
maintenance Seaport (was 3).