PAF will have to be satisfied with the reliability of the J-10’s engine, before considering a purchase. Some efforts will also need to be made to reduce the RCS of the J-10 and add the best Avionics, AESA, EW (including towed decoy), and weapons China will allow to be exported.
It would have to do all this; basically match the capabilities of the F-16 Block 72, for the PAF to finally close the door on the F-16 saga.
The added benefit would definitely be the possibility of J-10 being available for “loan” to the PAF in the event of war, or the possibility for the PAF to purchase more J-10s, or even move on from making the JF-17 Block III (after the planned 50 are completed) to producing the J-10; we still have hundreds of Mirages and F-7s that need to be replaced soon. A huge consideration would be cost for the whole project and the risk of getting sidelined from Project AZM.
Politically, procuring the J-10 would signally Pakistan moving deeper into the Chinese camp. The next 2 months will tell if Biden tries to mend relations with Pakistan, and agree to a sale of Block 72 F-16s, or ignores Pakistan’s defensive needs and therefore leaves Pakistan with no other option.