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Manufacturing hooked rims was made more difficult by the resins that were needed to make rim brake rims that were more resistant to being destroyed by braking heat. The properties of and additives introduced to these resins didn't flow as readily as simpler resins do. So our arc was seeing a lot less brake heat damage, but a ton more rims with unacceptable hooks. We saw this across a lot of brands, too.
Since disc brakes allow simpler resins to be used and the cooking procedures are much less fidgety, I built like 1000 rims without ever seeing other than a perfectly molded hook. We never saw impact damage to hooks on hooked disc rims.
Hooks still require a more complex mold and molding/demolding process.
If hookless is going to be stronger than hooked, the rim will be nominally heavier than an equivalent hooked rim because the sidewall in that hookless rim is thicker. The material makes it stronger, the lack of material makes it lighter. If can't have more material and be lighter.
Aero impacts will be dominated by the inner and outer width of the rim and how they compare to the tire's width. How the bead of the tire interacts inside of the rim below the hook will have at most a small effect on tire shape. I suspect that people are pulling this claim of better aero out of their backsides, but who knows?
There's no doubt that molding hookless rims is more efficient than molding hooked rims.
I personally use hookless on mtb and hooks on everything else.
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