I didn't mean to imply that LHD wasn't a good platform - it is for what it is designed to do. If we're lucky the LPH(RC) programme (pause for hysterics) will deliver something similar to replace Ocean and the LPDs. However - at 40000 tonnes LHD is substantially bigger than CVS.
The throw-weight is impressive, but what was the sortie count/mission profile when she was covered in Harriers? If she was running CAS/BAI missions only, the deck park required is much less than for integrated strike packages against any sort of IADS, with some sort of DCA posture. Thats the driver behind CVF size. Putting UK accommodation standards on LHD would result in a ship much bigger than CVF. It's not a cruise liner v warship argument either - 2SL has decided that for retention purposes, they want much higher standards (including iPod sockets!). That costs space and volume.
The last of the Wasps, LHD8, is currently estimated at $1.7Bn for a mod to an existing design. LHD(X) looks like being over $2Bn a copy. CVF is exorbitant, but is nothing to do with the ship size (or even shipyard jobs) and everything to do with the contracting strategy.