Isn't that what V shape means? V has not curve.
As opposed to U shaped rims. U is curved.
This is why I say these modern rim profiles are "v-ish".
"True" V-shape rims have flat walls that come to a point, like you saw on Lightweight Mielenstein or Mavic aero wheels from the mid-late 2000s. "Toroidal" and "U-shape" rims are characterized by a shape that bulges outwards, where the point of peak width and parallel walls is somewhere near the middle of the aerofoil chord (Toroidal) or closer to the spoke nipple bed than the rim bed (U-shape).
Unlike true V-profiles, "V-ish" profiles have a continuously bulging curve along the aerofoil profile to the spoke nipple bed. And, unlike U-shape/Toroidal rims, the point of peak width is no further from the rim bed than ~1/4 of the chord length.
Another key characteristic of modern V-ish profiles is the trailing edges (at the spoke bed) have much larger radii compared to rim profiles of old. Those early V and Toroidal rims that had bad handling featured really sharp trailing edge profiles, with curve radii as small (if not smaller) than half the width of spoke nipples. In contrast, modern V-ish profiles have trailing edges with a radius of around 0.5cm or greater.
