The biggest drawback is that Pakistan would be undergoing the JF-17 saga all over again, getting a brand new aircraft that will likely have the kind of technical issues and gremlins that all new aircraft have when entering service, which will give their technicians many long sleepless nights. Not to mention the likelihood of having to undertake costly upgrades in the future as more advanced Block variants are put into service. They were wise to wait for the J-10C variant to become available before finally placing their order for that aircraft. But the tradeoff is that Pakistan becomes the first country in South Asia to get a stealth fighter jet.