My understanding is that materials are stronger for the same weight, but we haven't made them of significantly greater protection (in terms of being rifle rated)...focusing instead on getting the same protection for less weight. Rifle rated SLAAP panels are rare and not widely issued.
Moreover, that's our helmets. Russian and Chinese helmets are weaker.
About rifle plates: rifle rated armor existed among Soviet forces when the 5.7 was developed, but it wasn't widely issued. The most common Russian body armor in use prior to the Ratnik program only even had 1 plate. Even where a country may have outer vests that fits a front and rear plate, that doesn't mean they actually have plates....and many times for CTSO countries, those plates are legacy products that are in unserviceable condition, not a living program involving replacement of damaged plates. From what I've gathered, most CTSO countries are using kevlar vests with no plates.
And, lastly, even on the Russian side: just because you updated your body armor to be a vest with front and rear plates doesn't mean all your troops actually have that. Conventional war logistics + mass conscription doesn't lend itself well for your troops all having the current body armor system.
So, there's still efficacy for the 5.7 and 4.6 in the roles for which they were designed.