alt Hacker Newsagreed on fingerprints, though i bet the rationale is coefficient of drag, not lack of experience with various door handle designs.
in the article, it shows a Magna-Steyr handle on a Mercedes Gelaendewagen, which looks like those on the Ineos Grenadier, and not very different than the ones that Ford uses on various trucks.
that contrasts with those on Audi and BMW evs, for examples i see often, where the CoD is a stated spec for ev shoppers, and the handles have motion to them, but are flush (but not Tesla vanishingly flush). Weirdly, some Porsches (intimately related to Audi...just read the shared parts) use flush handles and some the protruding handles with an actual handle.
i admittedly pay an unusual amount of attention to car componentry, sort of a hobby really.
The additional drag is negligible. People have been producing "racing doors" with handles for decades. They focus on cutting all the other features of the door like weight and mechanical complexity instead. It's an even more irrelevant consideration for consumers, who could save far more fuel by changing how they drive.
Flush handles exist as brand differentiators. They're a "futuristic" feel-good feature that consumers want, like engine noise, tablets, and colorful dashboards.