Hi Signalian, PAF / PN aren't buying J-15s for a carrier role so STOVL doesn't come into the equation. Yes, they may be able to touch and go if PLAN visits with a big boat. That's about it. FLANKERs are known to require a very long runway, this is one of the reasons India gave for going for a new platform. They can't operate from a good number of FOBs in the north (NW, NE).
You would also need to build new HAS to fit such large birds... well unless you could fold the wings. The point the
@Khafee made was that going for a navalized flanker with custom changes (like no folding wings) was not an option for PAF / PN due to time constraints. These are probably decisions made at the same time as the VT-4 / SPH and we were both discussing how things can go ballistic in the shorter term.
What Role PAF / PN Would Use the J-15
To highlight, I want to note that there are three wider concerns were a FLANKER fits in:
1. By allowing PAF the ability to strike the Indian South, and its Western coast. India does not have this area properly covered, just as Pakistan didn't have Baluchistan properly covered and India had been planning air operations from the South.
Operationally, this means India now has to divert resources (aircraft, radar, SAM, even construct bases perhaps) to the South rather than focusing on the North West alone.
This is the main reason
@Mastankhan has been asking for so long for the JH-7.
In the South, they have their economic stronholds like Mumbai. A strike on Mumbai or some of the ports would shatter foreign investment confidence for a decade. Suddenly their ports are at risk, and their prosperous south is under threat, something they never faced - ever.
2. We have all seen how PN is growing - from a brown water navy it is now closer to a blue water one. As the navy expands, it needs a better air umbrella as air strikes are the deadliest concern for all naval vessels. Operationally, there is only so much air cover JF-17s can provide over the fleet. They don't have the legs to be an effective umbrella for an expanded PN.
3. India is investing in expanding its own naval air power with new aircraft carrier and shore based aircraft. Pakistan has to counter this in some way or form, particularly as the IN is much larger and an air advantage will be catestrophic for the PN.
Will be hard to protect P-3Cs or anything else from India's gigantic flanker fleet and aircraft carriers. How will air cover be provided to them, out at sea... this is why Pak needs a naval fighter.