Vik was never designed as a AC! We all know what it originally was. It has non-optimal flight deck design with one central deck lift. This leads to a direct impact on possible sortie rates. Moreover, the bridge is also not located optimally making it almost impossible to have more than 2 aircrafts operating simultaneously!
Ah ok, now I get your point and I agree that of course might be a disadvantage.
The combination of LPD's (higher in number) with carriers provide much of the same benefits. Why do we need a force of 2000 marines (wasp et al.)? If we do, then why not have them go in 2 large LPDs and have vikrant type escorts with 8-10 fighters (instead of 16-20) and additional 5-6 transport helis/ attack choppers?
How? All they need is a good hanger design which vikrant has (unlike vikramaditya).
See, that is exactly the way I pointed out which the USN wants to go in future! One medium carrier with a mix of a few fighters, but mainly transport helicopters to deploy the troops and cargo that it carriers and additional LPDs that carries and land the heavy cargo, vehicles, or supplis.
We could use the normal Vikrant class similar, but although it will be in the same size as the America/Wasp class, it will be clearly less capable for this role. The difference is as I said before the design of both carriers! Vikrant is meant to carrier and support as much fighters as possible, that's why the deck layout is mainly to park fighter sized aircrafts. The interior design focus on large hangar and stores, for additional fighters, their spars, weapons and fuel of course.
An LHD, or LHA like the America class instead is designed to carry and support as much troops and transport aircrafts as possible. That's why they use mainly the STOVL deck layout which offers more space to park aircrafts on deck as you can see in the following graphic:
The interior design offers also a hangar deck, but mainly for helicopters, which needs less space for weapons, or fuel. Instead these carriers are designed to accommodate more additional troops!
The Vikrant class might able to accommodate around 800 troops, which is nearly 1000 less than a similar sized LHD, or LHA can.
So in this role, the Vikrant class design will limit the number of helicopters, troops and equipment to support these!
That's why I said, if IN wants an indigenous carrier for this role, it would be better to redesign the Vikrant class a bit to be more useful.
I also don't think that IN will need this much of landing capability, so a smaller helicopter carrier like the Mistral class might be enough, but we need a helicopter carrier in addition to our normal carriers.
Btw, I don't think IN should go for LPDs anyway and if you compare the specs of the San Antonio class and the Mistral class you will see why!
Displacement: 25.300t San Antonio vs. 21.300t Mistral
Crew: 497 vs. 1060 (including aircrew for aircrafts)
Troops: up to 800 vs. up to 900
Landing craft: 2x LCAC vs. 2x LCAC
Helicopters: 4x medium helicopters vs. up to 16 medium helicopters
Cost: $800+ millions each vs. between $400 and 500 million each
San Antonio Class Amphibious Transport Dock | Military-Today.com
Mistral Class Amphibious Assault Ship | Military-Today.com
As you can see, both are in the same size and can carry the same number of troops and landing crafts, but with the way higher number of aircrafts, the LHD can do this role better and faster than the LPD could do it. This advantage also allows the LHDs to serve in other roles like ASW, or costal patrol too, unlike the LPDs that mainly will be anchored in the base till a war, or a disaster breaks out.
Two Mistral class, covered by Gorshkov, or Vikrant for air support, would be a great increase of IN landing capabilites and means also 2 more carriers for ASW.