i wouldve thought the point is to use these old jets to force ROCAF to expend valuable flight hours.I think the point of that is to dunk on the RoCAF by showing them that even the PLAAF’s 3rd tier grandad flankers can still be useful against their top tier stuff.
With datalinks and co-operative engagement, there isn’t a desperate need for every jet to be packing top of the line AESA radars when they can just get sensor data downloads from friendly fighters and AWACS to get even better situational awareness and engagement range than they can with the best AESA radar can give them in isolation.