> No that is simply not true, seg faults provide useful debug info in any potential core dump they provide.
I'm not sure I understand this. Can't you get a backtrace out of a JavaScript exception just as well as you can get one out of a segfault? The segfault itself doesn't carry any information other than at best the faulting instruction and the nature of the fault, and you can surely get that out of a JavaScript exception.
Furthermore, a segfault is very often a sign of memory corruption that has already happened, possibly in the stack frames themselves. "undefined is not a function" is not. JS code that crashes with that error is in a much more debuggable state than native code that crashes with a segfault. And you can certainly configure your interpreter to take a coredump on an uncaught JS exception, which will definitely be more debuggable than a coredump post-memory corruption.
(Your personal attack is not an argument.)