Not at all. All those PSFs will have non-siege battles. Imagine them as settlements that the armies will move against, but then clash in a open field.

The big advantage of this is that now you can have "real" battles. Instead of having small-size stacks roaming the campaign map, we can make the AI consolidate in these positions, so when the players attack them, he will face enormous armies in a open battlefield.
GENIUS!! - tho sicily still really looks VERY crowded indeed.

I also like the idea of more "eremos" around the world, for gameplay this will probably mean, more reb... eleutheroi and not being able to build Guardtowers there. Will there be more regions like Sardina with a "mini-Eremos" that are not shown on the Map(you uploaded)?