I’ve done extensive testing (aided by community members) and I am confident the software is at the same level of reliability poly forwarder is at. However, it is still software and I haven’t mathematically proven it to be correct 
As you found it will be overwritten. It is overwritten on every restart of the sotware on MultiTech conduits. Keep in mind “autoquit” only works for the semtech protocol, the ttn protocol has no option to quit the software when the connection is lost. (Yes, I have been tempted to take that route in order to work around the reconnect issues but in the end didn’t have to resort to it)