An interesting question is whether China would build possibly smaller (relative to a LPD) LPHs to complement its 071 LPDs rather than building all-in-one LHDs. While I have long espoused China having more use for a LHD over a CV, I can see LPHs fitting the bill to complement the 071 in a dispersion strategy for flexibility in MOOTW during peacetime and for survival during wartime. This is especially true if building and operating multiple LPHs do not cost significantly more than operating a single LPD.
I think it's worth keeping in mind what a LPH, LPD, and LHD and LHA all are.
LPH = landing platform helicopter
LHD = landing helicopter dock
LHA = landing helicopter assault
LPHs, LHDs, and LHAs are the archetypal "helicopter carriers" but only LHDs have well decks, while LPHs and LHAs lack well decks and only operate helicopters and/or VSTOL planes.
That is to say, I don't think we should use the LPH designation to refer to "smaller" LHAs such as the Iwo Jima class, or the UK's Ocean class. If anything the LPH designation seems increasingly out of date, and if one wants to suggest a "smaller sized LHA", I think simply describing it as so is more accurate than using the older LPH designation.
Now, on the subject at hand, I personally also believe the Chinese Navy should consider building a number of smaller sized LHD type ships (note I use "LHD" -- such ships should optimally have the ability to take on landing craft and AAVs and to launch them as well), but this should not come at the expense of larger LHDs. (I also don't see why China should adopt smaller dedicated LHAs which lack well decks; forgoing well decks will make such ships dedicated helicopter carriers rather than more flexible amphibious assault ships which can perform a wider variety of missions and help contribute to carrying LCACs, LSTs, or AAVs during wartime. I'd rather have a Mistral type ship than a Hyuga or Ocean type ship)
That is to say, I think there is a benefit of having a large number of smaller aviation capable amphibious assault ships for the very reasons you mentioned (MOOTW, dispersion, and also lower operating costs during peacetime), but I think there is also a place in the Chinese Navy for a smaller number of larger and more capable LHDs that can support larger aviation complements, more landing crafts, and with more internal capacity overall.
Depending on how the economy goes, around 2030 I'd eventually like to see something like this:
8 25k ton 071 LPDs
8 22k ton LHDs
4 40k ton LHDs
To make 4 amphibious assault groups each with a 40k ton LHD, two 22k ton LHDs and two 25k ton LPDs
However, if the Chinese Navy is forced to choose between only procuring 40k ton LHDs vs only procuring 22k ton LHDs, the choice becomes somewhat more difficult to balance, as it will depends on the procurement and maintenance costs of both classes of ships and the budget available.
For instance, is the budget to buy and operate and maintain four 40k ton LHDs enough to buy, operate and maintain eight 22k ton LHDs instead? If not, then is it enough to buy/operate/maintain a smaller number such as six 22k ton LHDs? If the cost is equal for both, then are there any other downsides to cost regarding having more (but lesser capability) LHDs versus having less (but higher capability) LHDs with regards to the Chinese Navy's amphibious assault and sealift doctrine?