@Senile Sentry you have the right idea but your one-eyedness for India is stopping you getting to the point. Fact is Pakistan have only produced five fast bowlers who were good for any lengthy period in their history (Fazal doesn't count, he was a medium pacer). Arbitrarily cutting off at 180 wickets in order to exclude Shoaib (178 wickets) isn't needed, and while Asif only took 103 wickets we saw enough to know he was world class (and a world-class dickhead as well). You don't need to bring up the Indian bowlers, as India produced zero of that class in that period, the best being Kapil, Srinath and Zaheer who averaged 29.6, 30.5 and 32.8, pretty middle of the road.
With respect to Pakistan's 'pace factory' you just need to look at the remaining cast, albeit this is probably somewhat exaggerated by the brutally flat test pitches - in fact Pakistan have produced few bowlers with a 'good' (say average 25-30) in general, which is probably a testament to the conditions and also being poor away - as well as often playing two spinners at home.
You had Sarfraz, who average 32.8, and pretty much no-one else. Guys like Sikander and Akeem Hafeez would have faced strong competition even to get into the Packer or rebel tour depleted English and Australian sides of the period, and if anything the early nineties are even more barren. In the 00's the only other ones are Razzaq, who was an allrounder and averaged 36, and Gul, who was Chris Martin-level at best and benefited from a similar lack of competition. There's been no one else who's threatened. Amir fell away after comeback and Abbas is already nearly done with only 84 wickets to his name.
Where the kernel of truth in the 'Pakistan pace factory' lies is that they have been good in the 00s and 10s at producing guys who look good at first sight or on the speed gun, like Sami or Wahab (you could probably put Aaqib here too). If you look at the PSL or whatever there's no shortage of guys who can push past 145 km/h. Even now India hasn't done that, though the incentives are now there so I wouldn't be surprised if they start producing more quicker bowlers in the future. The thing is these guys - Musa being a good example - don't have the accuracy or smarts to make it, and the system is rubbish at nurturing them. That's one area where India has massively advanced, whereas in the nineties you had guys who had raw ingredients (say, Kuruvilla) not getting the support needed. Pakistan struggles there and keep looking for new wonder kids, whereas they should have made something of, say, Junaid.
Overall you are right. Pakistan has really had more of a hype factory, probably as the two Ws were so exciting and different compared to the predominant style of pace bowling at the time. So each new bowler is seen as the heir to that legacy. It feels like, at least in the English and Australian media bowlers are considered just that bit better or more exciting because they're Pakistani. The same even goes here, I remember being surprised how many people here seemed to rate Wahab when he came down to Australia in 16/17, when in fact he was rubbish and always had been. If you bring him up in conversation people will always mention the spell to Watson and ignore the rest of his career.
In comparison the West Indies from the late seventies to mid-eighties reeled off quick, good bowlers at a ludicrous rate. For no other team does Wayne Daniel play only ten tests. Pakistan have never, ever had anything to compare with that, and really aren't exceptional compared to other countries.