In addition to what you point out, this video also shows sandy runoff areas and billboards spacing out before the would be wall runner even gets to the wall. That’s going to slow them down too without unfairly punishing mistakes.
If what someone up thread said was true, and they added these slick curved walls to help newer players learn the game, they’re not doing the new players any favors by not teaching them how to properly take a corner. In real life, these things exist for the safety of the driver and spectators, but also to curb track limit abuse and corner cutting. Except friction. Friction exists in real life because physics is a thing. They have many options they could use, instead of building an over complicated solution to fix a problem of their own making. The only reason I can think of that they don’t is that changing the dynamics of existing tracks would have implications for rivals leader boards on those tracks. But if you hit the wall in rivals, you get a dirty lap anyway. Maybe they could make multiplayer configurations with anti-cheat layouts or something, so that they don’t affect the existing tracks too much.