Just people out diving from a boat. Someone (not their dive buddy) wound up OOG and came up behind them over their shoulder and ripped out their reg. No one approached them from the front. This is just 3 people/instances, not a significant sample size.
While it is hearsay, so far, only Bob has you, um, tied. So, in 50 years of diving, Bob experienced a few things and in all the diving you've done, you've heard of 3 incidents, in 40? years of diving lowviz has had his kid tug on his hose.
Yes, we train and yes, we should train but IMO, the way a diver rigs gear should probably be based on who else they're diving with and the type of diving they are doing.
It's not wrong to dive with the intent to donate secondary. It isn't more safe to dive a long hose and less safe to dive a secondary in the zone.
7' hoses are for cave divers. 5' hoses are because 7' was not necessary for open water.