Yes, sure, that's why I spend days trying to make that chicane as fast as possible and it feels so different with every car - it is like I have to 'learn' how to drive it again.
Video is very nice! I prefer the first one without doubt. I think the way you drive the chicane shows one weirdness of LFS; Many curbs, especially in S-curves, are cut with all four wheels. I assume that kind of cutting doesn't happen in real life? I'm not a racing expert, but for me it doesn't feel realistic.
Yes and no. While the license limits the accessible content, the S once stood for "Stage". So S1 was the first stage of development, S2 was the second stage and S3 is the current stage. One could argue that this correlates with the version. But while S2 felt very different to S1 at release, S3 feels more a continuation of S2.
video is awesome, would look good if at the end it then showed some of the cars in some race moments to give the feel of competing against others. Would be an epic video to showcase the cars