Ok, so according to you there is no promise of better result during an impact.
And we also know that a flat tire can come off a hookless rim more easily because it can't hook the bead.
Therefore, put 1+1 together, in conclusion, it's a sh*t system. End of story.
The only improvement regarding impact resistance that I have read about pertains to the hookless wheel sidewalls themselves; no other part of the wheel or the tires were mentioned. I do not have any experience riding hookless because I am too heavy (90 kg) to ride 25 mm or even 28 mm tubeless tires at ideal pressures (per Silca's calculator).