Right now the reason 4’s aren’t being held is because nobody wants to be the 100% GP gateway to hit the typically better teams that are holding the inland 4’s. You are not only meatshielding for high priority targets, but you’re exposed to the entire world for 100%.
With the change in perimeter access, it’s less likely that you’ll be stuck in that position and holding a 4 in general will be valuable. There will be so many targets available with these changes that they won’t be as much of a focal point as they are now.
It’s really not a difficult concept.