The downside to the groves is greater road noise.
And it’s like a cheese grater if you dump your Goldwing
Especially the transverse grooves that you show in #42. My God, it was HORRIBLE driving on those things in I-84. The longitudinal grooves are bad, too, when they aren’t perfectly aligned with the roadway because they tug the car a little left and right which is very annoying. But there’s no doubt they sure do help control hydroplaning.