When FN Herstal came out with the 5.7x28mm cartridge (and the accompanying Five-seveN pistol) a few years back, there was a bit of hand-wringing in certain circles over its ability to pierce body armor.
Bear in mind, the 5.7mm is really a souped-up .22 WMR, not some >5000 ft/s barnburner. It’s not the first (or only) gun made that’ll punch through body armor. Yet, everyone got their panties in a bunch over it.