The foremost threat that Pakistan anticipated and was given hint of, after 27 Feb 2019 Raid on IOK, was Indian retaliatory measures based on Cruise missile attack, few or a swarm to overwhelm PA/PAF AD. India sought it feasible since IAF had seen that PA/PAF AD units had not performed up to expectation on 26th Feb 2019.
Also there are a lot of AAA Guns (different calibers) in PA inventory, why do you think these AD guns exist in this era of warfare?
I hope the threat also serves as a lesson to develop the said capability based on existing uav and cruise missile technology base that we already have. It’s both effective and cost-effective.