Since I took the partially drivable hiking trail from S2 to S3 as a shortcut (50% drivable), I can only speak for the second part of this route. Machines were used to work on the path here and from my point of view it is now only an S1 at most! Which was a very welcome innovation.
After the Rasa Trail komoot.com/de-de/highlight/133646, after a little refreshment in the grotto of Rasa, this trail (Rasa-Bordei) follows. You absolutely have to keep left at the first junction (Bordei is signposted). It is very difficult to ride at the beginning, if not impossible. But then (as cadillac55555 mentioned before me) it gets a lot better, even wide and flowing - a lot of investment has been made, improvements made and made safer...