I agree, and I am leaning in this direction hence my questions. I wish BFG offered a battle belt to compliment their chest rigs. I like their low profile, lightweight approach. It would be nice to have gear that one could conceal under outer garments.You just strap it on. You can attach an H-Harness to it but I don't. It may move around if you are scraping the ground but when it does, it's very minimal.
I like it because it's simple and not bulky. It can easily be attached the bottom of a pack for more support making the pack and the belt one item. Kind of like this. His isn't attached but it can be with molle straps.
I just like simplicity. I can't imagine wearing a vest, hydration bladder, and a pack in the summer when taking to the woods. For me the modularity of the system works.