"And some things that should not have been forgotten were lost. History became legend. Legend became myth" (Lord Of The Rings opening monologue).
We should not forget that DGS / DGX were developed for classic Nitro Express (low velocity) cartridges
when Steve Hornady almost single-handedly in the US resurrected the classic African calibers, for which we should all be immensely grateful.
There is no fly on the DGS, and never was, and a lot of the original DGX history came from loading them at higher velocities than designed for. Specifically, loading at .458 Lott velocity the DGX designed for the .450 NE. History became legend. Legend became myth...
More than likely Hornady should have reacted much faster than they did, and proactively bonded the DGX rather than reactively doing it, admittedly too late.
Bonding the DGX allowed it to withstand higher velocities. Here is the only one I needed to shoot, out of my buff (recovered under the skin on the opposite shoulder after a 30 yd double lungs shot from a .470 NE) in August 2018
Everyone is free to prefer a Nosler Partition, a Swift A Frame, a Barnes X, a Peregrine, a North Fork, a Sledgehammer, or whatever, and that's OK, but the simple reality is that the DGS / DGX B just plain work. There is no need for folks to perpetuate the myth...
My personal choice is DGS / DGX B in the .470 because the identical profiles of the bullets deliver an identical point of impact for soft and solid; and Barnes X in the .416 Rigby where I prefer only one load because I can also use it on plains game if the trophy of a lifetime pops up while after buff.
PS: I have also seen with my own eyes early monolithic slugs (A Square Monolithic Solid in this case) push out the rifling on the barrels of my own pre-WWII Belgian best quality Jules Burry .450 #2 enough that you could discern the rifling from the outside when looking at a tangential angle, so you will not catch me firing a monolithic slug anymore from a classic double...