[transitorykris]

Lock-free-ness is a consequence of data being immutable in Erlang

[eridius]

You can avoid mutating data in C if you want to. People just don't, because mutation is so convenient and fast.

[stelonix]

Yes, but standard C has no way to tell the compiler a variable is immutable (immutability != constness), so unless you go non-standard (and very verbose at it) Erlang is still a better tool for the job.