No, it’s less grippy in the rain. The rougher road is far more practical and safer for vehicles, especially ones with only two wheels.

I’m not sure about that, although, I don’t know what specific road surface they use in Seoul.

Anecdotally, when we get new bike paths, it looks like that and the fresh asphalt used provides a lot of traction!

Once it gets worn from cars, it becomes slippery, especially once you add in oils from motor vehicles.

But the asphalt itself is not going to be slippery when it’s in good condition and not riddles with potholes.

My comment is also a compliment to the fact there are no potholes, “snakes”, oil marks, or anything in the roads shown in the photo. Impressive.