Cheap, innit. Barely buys you one Enve rim.
All the DA rims do have rather thin brake tracks, the WH-7900CLs or whatever they were called brought that to the fore because they were really light and well priced, so lots of people bought them, then discovered they’re light because there’s not much metal in the rim. Not really a failing of the product, just a wider number of people discovering a compromise with lightweight rims.
A bit like when Hope introduced the Pro 2, the number of “my cassette’s eaten my freehub” threads went up 5000%, but only because more people suddenly had aluminium freehubs!