Yeah also, while I've never really used the racing line assist, I'm not entirely sure it's optimal; should be a huge help for someone who doesn't know a track, but when you've learned the track and braking points for a specific car, do they entirely correspond to the suggested line? Is the line even optimized for car/tuning, or just like general advice info?
Bit same for ABS & traction control, it's one thing that it's faster not to use them if you can brake and accelerate perfectly without it, but apparently, in F5H, seems like a huge portion of players would benefit from it, myself included... Just takes 1 corner where you lock up the brakes and lose 2-3 positions to make it worth it vs gaining a marginal amount of time per optimal lap...
Plus being unfamiliar with most F5H tracks, and the fact that the cost of locking is so high, makes you brake much sooner than you would normally, which makes you quite a bit slower... Anyway, definitely different case for FM (less tracks to learn) and depending on skill levels.
Beginners/mid tier is likely where they benefit players the most, and where people are bound to use them most. But... I guess it will be reflected in skill rating. Whether someone can brake and accelerate properly, vs a less-skilled player using ABS/TC & even racing line, in the end, on the track, both players will be competitive. One is better, but for racing, for the better player, it won't make any difference in the race... It will affect rating; but who cares really... Should be all about the racing! And the safety rating is also something which will help tremendously for distinguishing good/bad players, non-depending on assists.