I am not sure if they ever landed with anything else, haha.And how often do the Russians do carrier landings with R27Es?
All armed Russian naval flankers were seen with these missiles(and r-73s) only. Migs (Russian or indian) bring something else to the deck, but not su-33s.
One reason may be that carrier weapon storage facilities weren't updated for PL-15 yet. Hard to tell the exact reason as an outsider, but I'm almost certain it can't be PL-15 dimensions.