It could follow the same layout as the JHSV, (hele deck, side ramp etc) allowing it to operate as a ship to shore connecter and use austere ports. To fulfill most of the same roles.
It would have a greater load capacity and ability to operate in worse weather conditions than the JHSV.
It would seem to be something very practical. I would imagine it wouldn't be too difficult to fit a helipad. 45-60m variants would seem to be appropriate. While Im not sure we order 6 off the bat, I would have thought a 2 or 3 ship build would have been a straight forward no brainer and at least provide that basic capability.
The diplomat article points out, part of what we want to use the LHD is preventive diplomancy. As such one will no doubt be on deployment in the region performing missions other than just ARG amphibious landings. So with only 2 ships don't know how much amphibious training we will get to train.
And with only 2 ships any long term mission will interfere with all this strategic action and any strategic preventative action will interfere with long term missions. So with only two ships, we are back to reactionary and picking up the peices. With no smaller scale missions (supported by smaller ships) we can't even do what we used to be able to do in the region.
Then throw in ideas like F-35B operations (for strike, CAS and sea control), ASW, working with allied forces in a variety of roles, out of region deployments etc. We haven't even got them in service and we want them to do everything. Hey they are flexible, but to utilise that flexibility you need a number of hulls to support it, train it and sustain it.
I would be throwing in for a third LHD, ideally 3+ stern landing ships. With that we then would have a range of options for a range of missions.