I suspect the insert is used in case a tyre burps or fails to seal a puncture, so you're not riding on the rim if you lose pressure. I don't think a regular insert is going to aid tyre retention. The defunct Schwalbe Procore system might help to retain a tyre on hookless beads - maybe they'll come back with a lighter version some time.

i've seen two bead failures in the last five years... both were hooked rim tires... both were wire beads... both tires promptly dismounted from the rims, and both then got snaffled up in the frames.

will bicycles be banned because of parts failures?
ask Campy, and mention their Snapped cranksets.
ask Viscount, and mention their Death forks.
etc.
Viscount made a better fork steerer, and warrantied the forks involved... public opinions ended the bikes, Death fork or not.
Campy got away with rupturing testicles, worldwide... did they warranty any of their failed parts?

so far, in this thread, i've seen opinions, but zero relevant facts mentioned to back up those opinions, other than unfounded fears.
will the Rider's Union diss Bike wheel of all kinds? even though evidence shows TIRE failures as the main cause of tires coming off rims, and peloton pile ups.... and inserts causing lockups and crashes.

the UCI banned Disc brakes for many years because "someone might get burned or cut by a disc"... Will they ban Chainrings and sharp edges on Pedals too??? my shins look like a minefield... i have two marks on my left foot right now from a chainring on a project bike, in my home.
maybe the UCI should ban homes.
by banning the disc brakes, how many riders ended up melting down tubes while braking on a long, fast descent?
i have,,, a rear tire, luckily, i managed to not go down, that time... The south end of Touchstone Drive, where it meets Carmen Drive... Mountain Park, Lake Grove Oregon.
i still don't know how i didn't melt a tube, Hwy 26, westbound from Govt. Camp, Oregon... luckily the sharp right, just below the runaway truck ramp, has now been softened by cutting away 100+ feet of solid volcanic rock Cliff.... the "Viewpoint" is the Old Corner line... pucker factor 110, on a scale of 100.

up next.. the bike racer union demands roll cages, air bags, and safety harnesses for all racers.

sorry... just pointing out the insanity of panicked knee jerk opinionating.
the tire went flat... blame the air for exiting.

are you aware of how little pressure holds a bead in a hooked rim?
are you aware that all the "hook" does is keep the tire on the rim when INFLATED, and NOT when the tire loses inflation??
and how that hook only retains a tire if that minimal outward pressure is maintained?

note that the article about the "dangerous hookless rims" in the UAE Race fails to mention what the ACTUAL TIRE FAILURE was.....

no one openly warranties race failures, btw.
i have seen quite a few wink/nod warranties, though...

the tire bead kept your "hooked tires" on, not the hook.
Super supple sidewalls and Foldable bead tires have effectively ended ANY minimal advantage to a hooked rim design.
once the air exits, all bets are off.

Really nice try, but……. Still not gonna ride hookless.

Did I mention “personal choice” !

Barry

As industry insider Psimet2001 points out in this previous post, all the arguments defending hookless ignore the fact that hookless rims for medium- and high-pressure tires disappeared from the market in the 1980's and reappeared only when carbon rims came on the market. As he notes, the same manufacturers that sell hookless carbon rims continue to produce only hooked versions of their aluminum rims. Why were no hookless rims manufactured for 40 years?

Edit: here's another post from wheelmaker Psimet2001 on the topic. That previous thread on the topic of hookless has a lot of good info.