I think it’s a mental thing. On a hole that doglegs with the slope, a tee shot shaped properly is generally rewarded with extra roll (fun), while a tee shot curving in the other direction loses some roll but is otherwise fine (a clear disadvantage, but not bothersome).
On a hole that doglegs against the slope, a properly-shaped shot stops more quickly (helpful, but not very satisfying) while one shaped the other way gets kicked into a worse position (deserved, but annoying).
Holes that dogleg against the slope are great tests, but the results of various shots are generally less enjoyable.