It's only a placeholder system as Scawen has said himself, it doesn't really matter whether there is visual damage or and the suspension is only one part of the car that can get damaged, and it's not at all realistic in the single seaters anyway.
42 is more than 20, likewise GTR can go well beyond that (96?)
I'm not trying to have a go at you, just pointing out that whilst these low points have been fixed over S1 they are still a long way off other sims and where they could (and by S3 final should be).