Ahava beat me to it, the Zeagle system is a one-handed release. Unless modified (as is likely here with all 12 behaving the same) it is no more difficult than a belt. You also have easy access to the access zipper to pull the weights out manually. BTW: I can modify a belt to not release just as I could modify an integrated system not to release as intended. The simplest way would be to to place a crotch strap over the belt. This can be done on accident or on purpose, same results, the belt drops a couple of feet, out of reach until you release the harness.
I do agree with you, having all your weight on your rig makes ditching/donning you rig underwater much more difficult. I would also agree that many of the other integrated systems out there are probe to premature / unexpected release of weights. Both of these issue combined with trim issues long ago steered me away from integrated weights in cold water, but none of these factors are reported to be an issue here.
You did touch a sore spot, just not the one you think. The sore spot (for me) is blaming gear for multiple operator issues and poor judgement.