I'm not saying this doesn't happen in other BFs or other games, but, to me, this is awful. Low settings should give you better FPS and *maybe* a somewhat simplified view. It shouldn't give you hacks... Check out the wheat field (and some of the grasses on the river bank). If most trees and bushes are maintained at low settings, why not crops and grasses?
Undergrowth Quality Ultra (medium and high is similar)
Undergrowth Quality Low (foliage-hack)