No, it's valid question for those of us that aren't issued MR goodness; you may be wondering WTF? But as the man said, there is a certain affinity for the ALICE-type systems within the community because: 1) that's what they were brought up with; it's just "home" for a lot of folks, and 2) it still fucking works!
So yeah I get it, on the face of it, you're wondering why a guy would shit-can his high-speed Gucci pack and "regress" back to the lowly ALICE-type system. Two reasons really. The bag shape/ external pouch arrangement, and the frame.
First the bag. Within mil-spec circles there is an affinity for a square-shaped bag with extensive external pouch system. The reason for this is it simply works for them.
The second reason is the frame. No matter how good an internal frame design you make, there are those who believe that an external framed-ruck is just the optimal design for mil-spec work. Opinions vary but I count myself as among this group as well.
The reason my buddy has gone this route is because he has spent extensive time with heavily loaded internal framed rucks and was not happy with them. He used the original NICE framed rucks, on operations, in the 07-08 timeframe, and was not happy with them. So he fell back to the tried and true ALICE-type system. Better but still issues. He then decided to give the new gen NICE frame a second chance, which was an improvement, but still not quite there. I then introduced him to the Crossfire frameset. Then he was happy.
Now the whole point to this exercise is this frameset gives you the best from both worlds. And is back-wards compatible with any ALICE-type system. So while on the face of it, it may sound a little crazy, it actually gives you the perfect blend of old and new. He really loves this set up because, well, it just works for him. And as added bonus, he said wearing BA with it is much more comfortable, compared to a MR pack with bolsters. So there you are.