But debugging mutable state is much easier than debugging a distributed system. Even in C if some global gets mishandled I can just use: gdb, dtrace, strace or

But debugging mutable state is much easier than debugging a distributed system. Even in C if some global gets mishandled I can just use: gdb, dtrace, strace or even just look at a core dump and know that whatever caused the problem will be discoverable. I have no such guarantee debugging an issue across a distributed systems service boundary.