I've had a lot of aluminum free hubs with gouges. Some bad enough that it took a little bit of effort to get the cassette off.
I've never had a freehub get to the point the cogs wouldn't stay in place, even on a tandem where you're putting twice the torque to the hub.
At most, it's a slight annoyance. If anyone ever got an aluminum freehub to the point of failure, I'm pretty sure they got a lot of use out of it first.
So just keep using the aluminum body, and if ever does fail, replace it.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.