Not sure exactly what you mean by rocks getting eroded into points "out 0n the flatlands".

It's certainly true that Spirit is seeing plenty of sharp pyramidal ventifacts in Gusev, but they are basalt. Oppy is seeing an empty plain with a surface armour of spherules, and no rocks, pointy or otherwise. (except where a young crater like Fram has chucked stuff out)

The sulphate rock in this whole area is incredibly soft and mostly erodes away top whatever profile the wind forces. Excdeptions are that more resistant sections form rounded knobs, sticking oit from crater walls, on a variety of scales.

Oh, and I also saw that "footstep on the edge" image, and used it to wind-up Bruce Moomaw, who had been worrying about the rim giving way under the weight of the rover...