Other than Pakistan's own JF-17 Thunders, PAF has not acquired another foreign platform since 1988. That's 31 years.
And, PAF has ruled out adding another foreign platform to it's platform.
How is it that Pakistan has managed to produce 121 JF-17 Thunders for its own air force when the economic situation of the nation tells us, it shouldn't even be possible for a third world country like Pakistan?
The Block-3 will be more advanced than any of the F-16s in Pakistan's inventory. How is that even possible for a third world country like Pakistan which shouldn't have the industrial base for it? Why is it that no one has even seen a single photo of the Block-3 yet but it'll be with PAF from March 2020 onwards?
Pakistan is committed, determined and ambitious enough to build its own fifth generation fighter and it will do it Insha'Allah.