Nurse/Jacko,
You keep missing the point. Why not ask the punters what THEY want. It would seem the Yanks did.
Do you want a large force in an LZ at the same time, giving more firepower?
Yes
Do you want more lift capacity?
Yes
Do you want to go faster?
Yes
Do you want a proven option?
Yes
Seen as you are about to launch Apocalypse Now to rescue a lost F16 mate, does a percieved noise surplus bother you?
Nope
The CH47 Vs Merlin downwash is negligble. The Chinook has normally finished with the air though.