In which specific ways is the JF-17 optimized for PAF? I'm asking because I genuinely don't know. If you're talking about how the monitors are set up or the layout, that's too trivial to matter. The plane is assessed based on its role. As a single engined, air superiority with secondary CAS, ground attack, and anti-ship, it's mostly a multirole fighter not too dissimilar to f-16 or gripen. No reason why this can't be exported and modified slightly for other countries. Reason it hasn't seen any exports is more an issue of politics, economics and price, rather than capability and jf-17 being too tailor made for PAF.
It's no conincidence the JF17 look so much like the F16.
Form follows function, and basically the PAF's wish list boiled down to a jet that is essentially a mini-F16 - with very good turning capabilities, a powerful radar yet cost only a fraction of the F16 to both purchase and operate, and that's what CAC delivered.
If you look at the kinds of jets CAC prefers to design, you get tailless delta canards.
The JF17 is significant departure from CAC's preferred style of fighter design.
Had CAC and the PLAAF been given the lead on the JF17, the design would have either ended up as a mini-J10, or a beefed up JL9.
If you look at the original Super-7 programme that turned into the JF17, you will see that the PLAAF wanted a BVR capable J7 that was only marginally more expensive than the vanilla version while retaining as much parts commonality as possible to allow them to make the most of their existing J7 maintance facilities and spare parts stocks.
I think it's even possible that the original JF17 programme got split in two, with CAC retaining the PAF version which became the JF17 as we know it, while the Chinese version went to Guizhou, and eventually became the JL9 trainer as the J10's success deminished the PLAAF's interest in a BVR J7, so they just made it a trainer instead.
The PAF's fixation with the F16, and desire to keep costs down meant the JF17 retained 3rd gen aerodynamics and is in a bit of a niche weight class.
Had the PAF allowed CAC to play to its strengths, they probably would have gone for a mini-J10, which would have been a direct competitor for Gripen customers.
OTOH, if the PLAAF was still onboard and was talked out of the Super-7, they would have demanded something with more range and payload, so you might have had an enlarged JF17 running on AL31s, which really would have been a Sino-F16.
As it is, the PAF got its dream plane in the weight and price range it is happy with. However, it does leave the JF17 in a bit of an awkward position in the market place.
Anyone who operated F16s and love it as much as the PAF could and would just get more F16s.
Those who can't get the F16 don't have the same emotional attachment and investment in the design, and so would find its size and range limiting while also being suspect about its 3rd gen aerodynamics roots, especially in comparison to truth full blooded 4th gens.