Just goes to show that modern SAM systems are usually hyped. They're dangerous for 4th gen aircraft, but 5th gen isn't a requirement for SEAD/DEAD. If the aggressor possesses UCAV and Cruise Missile capabilities en masse, they can be handled. The Tomahawk attack on Syria which bypassed S-400s should've been a huge wake up call (Russian claims notwithstanding.) And these are all still subsonic threats... supersonics are much harder to defend against, let alone hypersonics.