So all failures are user failures, because o-ring and hose failures are simply not replaced before wearing out. If a battery, o-ring, and hose has no guage to say when they are wore out, then according to your logic it is a user failure. So, maintenance is a user function, and all equipment failures are user failures. Not logic I would use but again, you do you.I don't want to deter you from your quest to argue with me, but I would submit that a transmitter "failure" during a dive due to a bad battery is not a transmitter failure, but a rather a user failure.
I have attempted to end this discussion several times and will not be responding again. Your attempt to convince me and others to stop using an SPG is a fruitless endeavor, but keep trying, someone might listen.