Another issue I have with wantonly adjusting Asian pacemen relative to their counterparts is that, imo Subz doesn't account for era and differing conditions across non Asian countries etc.
I'm going to speak from a west Indian perspective because that's what i'm most well versed in. Up til the 70s/80s WI attacks were heavily spin influenced and wickets in the WI while not spin friendly, for most of the 50s and 60s were some of the flattest worldwide. If I'm not mistaken they used matting in Pakistan (could be wrong). Not surprises then that a world class paceman like Fazal, emerged a bit before Hall. Things obviously changed in the late 70s and through the late 90s.
Then you compare an England to the WI and I don't think anyone would argue that English conditions are more conducive to pace than in the WI, yet despite debuting in 1928, and producing flat wickets until the 70s or so, WI have produced more world class pacemen than England. So it's not just the wickets and conditions.
Currently, for like maybe the last 10 years or so, while India has experienced a glut of class pacemen, WI have gone the opposite direction. WI is experiencing what India used to. Except at home, and that's mostly down to the use of Duke ball, because afaic, pitches in the WI are as slow as anywhere else. Why is that? Just food for thought....