It gives one flexibility in terms of servicing and repair.
Yes, in fact, you would be a fool not to carry a spare Flight hose in your save-a-dive kit. Miflex hoses are lightweight and abrasion-resistant...but they can fail.
Also, many divers prefer to dive their reg setups with certain hose lengths. Something tells me that if a Flight owner wants to select a non-standard hose length, he is not going to get favorable pricing from Apeks.
I fully understand the concept of having flexibility in terms of servicing and repair, what I meant by 'why would you want to put a normal hose on a Flight?' is why lose the lightness. You would only want to put a normal hose on in an emergency, and as I said you could just take a spare Flight hose with you to counter that issue. If you really want a lightweight reg you can stick any old hose on, get the Mikron.
Mark