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Pakistan has produced a lot of world-class players. But I agree with you that the setup of Pakistan cricket is not very good, to be honest. And domestic setup is obviously not as it should be.
Domestic cricket was always a concern for Pakistan. Previously it used to be dominated by the club sides, but then the PCB rightly moved to a province-based setup. The current setup has improved the quality a lot, although a lot of work still needs to be done. Asking some of the national team members to take part in the domestic matches, and telecasting some of the important matches on TV can be very helpful. Also, it will be a good idea to have some of these domestic teams to visit SENA nations once in a while, for friendly matches against county or Sheffield Shield teams.