Was just talking to a math teacher about swarm technology.
“Safety in numbers”
“the tyranny of numbers”
Saturation attacks have been pretty much known to be the only way to defeat Western style point defenses for quite a long time now - so you need quantity for that.
You don’t even have to have a drone swarm to do that. In fact, the PLAN aka Chinese Navy have a rather ugly little scheme going.
Let me introduce you to the PLAN’s Type 22 missile boat.
https://en.wikipedia.org/wiki/Type_22_missile_boat
This is a small stealthy surface combatant whose main purpose in life is to survive undetected long enough for the 8 shipkiller missiles or the rumored option of 4 large capshipkillers it carries (look at the HUGE box launcher on the back) to be launched from just over the radar or visual horizon. They have so far made over 80 of them. And they are all datalinked.
So, USN sends over a CBG, and all of a sudden out of nowhere, the CBG suddenly has to deal with as many as 640 seaskimmers appearing out of nowhere at practically point blank range. CIWS and Aegis is not going to be able to stop even a significant fraction of those before they start impacting.