[twirligigue]

Why can't we polish concrete more? Buildings and benches would be so much more attractive. Perhaps more weather-resistant too? But pavements slipperier when wet...

[throwaway0a5e]

$$ is why. It's expensive enough that it's often not done for floors let alone odd shaped surfaces you can't drive a buffer over.

And yes it does make the surface longer weathering at the expense of friction.