I agree with you Goknub. Large quantities of supplies are cheaper to move by sea lift than by air lift.I would disagree somewhat, even with HADR operations the majority of equipment will still need to be landed via sea if we are to conduct more than a token effort. This is the key reason why I'm disappointed the LCH replacement isn't a higher priority. The ADF will be less effective if it doesn't have a vessel to conduct small port, intra-theatre lift and remote island operations. This is relevant for everything from HADR to war fighting. This isn't to say aviation isn't also a vital component.
Aircraft need appropriate air strips, large ships require appropriate port facilities. Appropriately sized amphibious vessels can by pass established port facilities, they just add so much more flexibility and give so many more options.