Also all the TLS, SSH, Wireguard and other encryption, anything with long-persisted secret information. Everything else, even secret (like displayed OTP codes) is likely too fleeting for a snooping attack to be able to find and exfiltrate it, even if an exfiltration channel remains. Until a better exfiltration method is found, of course :-(

I think we're headed towards the future of many highly insulated computing nodes that share little if anything. Maybe they'd have a faster way to communicate, e.g. by remapping fast cache-like memory between cores, but that memory would never be uncontrollably shared the way cache lines are now.