Personally, I found, when using packs in the past that had load lifters, that if I needed to tighten them too much, it was a sign that I had too my weight on the outside of my pack.
The problem with those big pockets on the outside, especially with UL gear, is that the "convenience items" we usually store on the outside pockets, tend to be pretty heavy compared to the stuff in our pack shifting the weight to our backs.
YMMV, but I find, that when I have my pack loaded properly (by my terms, weight focused on my back), I can leave my shoulder straps almost loose, and cinch up my hip belt, and my pack still hugs my back.
If I needed load lifters, I'd feel I wasn't packing correctly.
That's just me though. It's important to mention that I personally a) hate using sternum strap, and b) prefer all the weight on my hips. c) have move to using zero shoulder strap padding in my GG pack in recent trips.