Mass and momentum are what is being neglected..
For the record Dallas, Tx PD started running 9mm as issued in 1988'ish. They used the 115fgr Hornady XTP and had issues with bullets not expanding (clogging up with clothing) or shallow penetration. They then moved to the Remington +P+ 115gr JHPand the problems persisted. In 1996 they did two things, they authorized the .357sig, and they changed their 9mm duty load to 147gr Winchester Ranger SXT, and later to Ranger Talon. The problems have gone away except for some old cops tales of woe about 9mm.
Contrary to what certain magazine and book writers will tell you, even in the 80's 147gr JHPs did just as well (or poorly) as bulkets in other weights.
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