The size is one thing. The mastery of an AESA radar, a masterpiece in electronic system, another.
The chinese weapon system are all not combat proven. They are not bench marked in trainings against potent west counterparts. They are mainly direct derivatives of russian weapons, and the ukrainian war is not really a nice selling argument for russain an so chinese products.
No. JF17 is already a son of Mig21. Using it to make another son will be a mistake (as Boeing with the last version of B737...).
J10 is the right answer for Pak.
At a certain point, the older JF-17 will need to be replaced. If the budget grows due to a growing economy, I would agree; transitioning to the J-10 is the way to go, but if the budget stays limited the PAF may only be able to afford to keep modernizing the JF-17 to keep up.
As far as getting “combat experience” for Chinese electronics, the Chinese maybe stepping up that on their own by their increased tempo of exercises around Taiwan, but the PAF may also have to prepare custom JF-17s (with radars that only demonstrate certain waveforms and sensitive ECM equipment) for exercises with friendly nations operating planes like the Eurofighters, F-15s, F-18s and Rafale.
The same sub-systems could be put in either aircraft, but they would do the most benefit in a J-10 then the JF-17. Also, the PAF builds and can repair the JF-17 in house. Perhaps updating the design to accommodate the more powerful engine, if available, would be enough to allow it to soldier on for a few more decades as a backbone workhorse platform.
On the other hand, if the PAF transitions to J-10 local production, once the Block 3 JF-17s orders are filled, it would be the most beneficial for advancing domestic fighter production capabilities. J-10 upgrades can be applied quickly in house and after the initial 25-36 order, and a further at least 54-65 J-10 could be built partially in Pakistan.
Domestic license production of the WS-13 and WS-10 should also be a goal, so that the WS-10 could be used in PAF variants of the T-FX. Backfilling as much ToT in sub-systems should be a goal to keep maintenance as quick as possible.
I agree, transitioning to the J-10 would be a better use of resources then continuing the JF-17’s development, but maximizing the potential of the JF-17 should be looked into, considering nearly half the PAF fleet will be made up of JF-17s. The sooner this design is maxed out and build and the older planes rebuild with the upgrade, the PAF can then move on to other platforms, like the possibilities with a WS-10B3 or WS-15 equipped J-10; such as supercruise for long range naval operations, to take on the F/A-18E/F that are probably soon to be inducted by the IN.