Interesting discussion, I personally like F4 racing line. I use it to learn tracks, there are 940 track/car combos so difficult to learn all beforehand. Although I think if you learn a track in one car, it will help you learn the track in another car. F4 may be bad as it may spoil you, but in the context of a MCR server, I think it is best for the community as a whole to have F4 rather than everyone late breaking and suiciding into Turn1. I too have missed having the racing line in custom tracks, but the feeling of satisfaction you get when you get a good or "great lap" after learning the track by yourself within a few laps is great. Take A11, its a hoot!
Coming to racers leaving server, I am not sure about the stats, but personally I think selecting BL will make most of us disconnect, much more than selecting any custom layouts. One day one CG member exclaimed jovially, "Why this track? If you want BL go to demo server
", lol, I completely agree with him, In fact I think BL can be removed in S2 server. But hey that is just me, there may be people who like BL. But BL is too cliched, and too small, class1 gets lapped twice. But I think that wont happen as Dave disabled GT2 there. The track is too narrow and the back Esses will punish you if u stray away from racing line, so incidents like fast cars ramming slow cars and lapped cars blocking fast cars, are more in BL. And like how Dave mentioned about these small tracks never being designed for GT2, I have a feeling BL was never designed for any kind of fast car over 150 BHP. Probably we can limit BL to use only class 1 and class 2/2+. there. But that would become same as S1 I guess.
But as such, I have no complains with the status quo. I can live with BL and I can live with having no racing line in custom layouts.