If you look at Emain's map here
You can see that 25% of it or more of its blocks are zonewalled/mountains. Then more of the space is "gated" or a "lake" that requires fulfilling strategic objectives to access/have a decided zone of control, like PK guards/DC guards.
NF Emain:
There are dozens of points where people might port and attack from, all along the coast, from two possible entries through Breif, two or three keeps to port to and from. With the width of the "avenues" of entry as well, groups and even zergs could easily miss each other depending on which hill or side of the river they're hugging.
You can see that 25% of it or more of its blocks are zonewalled/mountains. Then more of the space is "gated" or a "lake" that requires fulfilling strategic objectives to access/have a decided zone of control, like PK guards/DC guards.
NF Emain:
There are dozens of points where people might port and attack from, all along the coast, from two possible entries through Breif, two or three keeps to port to and from. With the width of the "avenues" of entry as well, groups and even zergs could easily miss each other depending on which hill or side of the river they're hugging.