For me personally, this app (in combination with the "AI Spline Editor", of course) is the most important innovation in the history of AC modding since the invention of the "Content Manager"!!!
I only drive against the AI, but I've always had tracks that were unusable due to bad AI lines / boundaries / brake hints. I'm a user, not a modder, but I've already been able to "save" several of these tracks so that I can use them for AI races!
Dynamic racing lines are a double-edged sword. We've known for over 20 years: There's a risk that you won't develop any sense of the track at all, but will just look down and stupidly follow the line lap after lap. It's not just in simcades like "Gran Turismo" that I've repeatedly seen people who can't remember the course even after dozens of laps, and don't have the slightest idea where their braking points should be! There is no other tool in the entire genre that can sabotage your own development so much - the only thing worse is "automatic braking" like in "Forza Motorsport".
But like many in the AC community, I am addicted to mods. I will probably never use many of the well over 200 tracks, and I drive on others so rarely that I can't even remember the course. I now really like using this app for these purposes (only for the first few laps, otherwise the immersion is ruined).
Thank you for this great app :-*