TLDR: You can use pluggable transports. It's super difficult to build a low latency mix-net that covertly works inside an adversarial network. In addition to

TLDR: You can use pluggable transports. It's super difficult to build a low latency mix-net that covertly works inside an adversarial network. In addition to the current models over which onion/garlic routing are based upon you would (at least) need to add to the core of your software traffic obfuscation, a series of covert channels, NAT bypass, ... Tor and other mix networks simplify the problem assuming that there's a portion of the Internet that is free and introducing censorship circumvention mechanisms. Of course, the assumption is increasingly untrue.