The AFV Program was cancelled. Thus no OTH swim ashore Amtrac's. Which if one argues OTH as it was presented with the Osprey, LCAC, and AFV....there just isn't OTH currently.
LST's went away when the LCAC arrived but landing directly to the beach with heavy cargo, tanks, (now Amtracs), large groups of personnel, artillery....fuel....ammo....still remains necessary if one wishes to support a beach head. Helicopters and Ospreys cannot do the task without the beach landing capability of the LCAC.
Nix the well deck....and you nix that capability and must have the conventional LHA and the new Air Only LHA....which means either more ships or less capability and for sure less flexibility.
The Navy/USMC wrote themselves a Specification they cannot meet.